Provided by: graphicsmagick_1.3.12-1.1build1_i386 bug

SYNOPSIS

       gm animate [ options ... ] file [ [ options ... ] file ... ]

       compare [ options ... ] reference-image [ options ... ] compare-image [
       options ... ]

       gm  composite  [  options  ... ] change-image base-image [ mask-image ]
       output-image

       gm conjure [ options ] script.msl [ [ options ] script.msl ]

       gm convert [ [ options ... ] [ input-file ...  ]  [  options  ...  ]  ]
       output-file

       gm display [ options ... ] file ...  [ [options ... ]file ... ]

       gm identify file [ file ... ]

       gm import [ options ... ] file

       gm mogrify [ options ... ] file ...

       gm  montage  [  options ... ] file [ [ options ... ] file ... ] output-
       file

DESCRIPTION

        GraphicsMagick's gm provides a suite  of  command-line  utilities  for
       creating, converting, editing, and displaying images:

       Gm  display  is a machine architecture independent image processing and
       display facility. It can display an image on  any  workstation  display
       running an X server.

       Gm  import  reads  an  image from any visible window on an X server and
       outputs it as an image file. You  can  capture  a  single  window,  the
       entire screen, or any rectangular portion of the screen.

       Gm  montage  creates  a composite by combining several separate images.
       The images are tiled on the composite image with the name of the  image
       optionally appearing just below the individual tile.

       Gm  convert  converts an input file using one image format to an output
       file with  the  same  or  differing  image  format  while  applying  an
       arbitrary number of image transformations.

       Gm  mogrify  transforms  an  image  or  a  sequence  of  images.  These
       transforms include image scaling, image rotation, color reduction,  and
       others. The transmogrified image overwrites the original image.

       Gm  identify  describes  the  format and characteristics of one or more
       image files. It will also report if an image is incomplete or corrupt.

       Gm composite composites images (blends or merges  images  together)  to
       create new images.

       Gm  conjure  interprets  and  executes  scripts in the Magick Scripting
       Language (MSL).

       The GraphicsMagick utilities recognize the following image formats:

       Name   Mode Description
        o  8BIM      *rw- Photoshop resource format
        o  8BIMTEXT  *rw- Photoshop resource format
        o  8BIMWTEXT *rw- Photoshop resource format
        o  APP1      *rw- Photoshop resource format
        o  ART       *r-- PF1: 1st Publisher
        o  AVI       *r-- Audio/Visual Interleaved
        o  AVS       *rw+ AVS X image
        o  BIE       *rw- Joint Bi-level Image experts Group
                          interchange format
        o  BMP       *rw+ Microsoft Windows bitmap image
        o  BMP2      *-w- Microsoft Windows bitmap image v2
        o  BMP3      *-w- Microsoft Windows bitmap image v3
        o  CACHE     *--- Magick Persistent Cache image format
        o  CAPTION   *r-- Caption (requires separate size info)
        o  CIN       *rw- Kodak Cineon Format
        o  CMYK      *rw- Raw cyan, magenta, yellow, and black
                          samples (8 or 16 bits, depending on
                          the image depth)
        o  CMYKA     *rw- Raw cyan, magenta, yellow, black, and
                          matte samples (8 or 16 bits, depending
                          on the image depth)
        o  CUR       *r-- Microsoft Cursor Icon
        o  CUT       *r-- DR Halo
        o  DCM       *r-- Digital Imaging and Communications in
                           Medicine image
        o  DCX       *rw+ ZSoft IBM PC multi-page Paintbrush
        o  DPS       *r-- Display PostScript
        o  DPX       *rw- Digital Moving Picture Exchange
        o  EPDF      *rw- Encapsulated Portable Document Format
        o  EPI       *rw- Adobe Encapsulated PostScript
                          Interchange format
        o  EPS       *rw- Adobe Encapsulated PostScript
        o  EPS2      *-w- Adobe Level II Encapsulated PostScript
        o  EPS3      *-w- Adobe Level III Encapsulated PostScript
        o  EPSF      *rw- Adobe Encapsulated PostScript
        o  EPSI      *rw- Adobe Encapsulated PostScript
                          Interchange format
        o  EPT       *rw- Adobe Encapsulated PostScript with MS-DOS
                          TIFF preview
        o  EPT2      *rw- Adobe Level II Encapsulated PostScript
                          with MS-DOS TIFF preview
        o  EPT3      *rw- Adobe Level III Encapsulated PostScript
                          with MS-DOS TIFF preview
        o  EXIF      *rw- Exif digital camera binary data
        o  FAX       *rw+ Group 3 FAX
        o  FITS      *rw- Flexible Image Transport System
        o  FPX       *rw- FlashPix Format
        o  G3        *rw- Group 3 FAX
        o  GIF       *rw+ CompuServe graphics interchange format
        o  GIF87     *rw- CompuServe graphics interchange format
                          (version 87a)
        o  GRADIENT  *r-- Gradual passing from one shade to
                          another
        o  GRAY      *rw+ Raw gray samples (8 or 16 bits,
                          depending on the image depth)
        o  HISTOGRAM *-w- Histogram of the image
        o  HTM       *-w- Hypertext Markup Language and a
                          client-side image map
        o  HTML      *-w- Hypertext Markup Language and a
                          client-side image map
        o  ICB       *rw+ Truevision Targa image
        o  ICC       *rw- ICC Color Profile
        o  ICM       *rw- ICC Color Profile
        o  ICO       *r-- Microsoft icon
        o  ICON      *r-- Microsoft icon
        o  IPTC      *rw- IPTC Newsphoto
        o  IPTCTEXT  *rw- IPTC Newsphoto text format
        o  IPTCWTEXT *rw- IPTC Newsphoto wide text format
        o  JBG       *rw+ Joint Bi-level Image experts Group
                          interchange format
        o  JBIG      *rw+ Joint Bi-level Image experts Group
                          interchange format
        o  JNG       *rw- JPEG Network Graphics
        o  JP2       *rw- JPEG-2000 JP2 File Format Syntax
        o  JPC       *rw- JPEG-2000 Code Stream Syntax
        o  JPEG      *rw- Joint Photographic Experts Group
                          JFIF format
        o  JPG       *rw- Joint Photographic Experts Group
                          JFIF format
        o  LABEL     *r-- Text image format
        o  LOGO      *rw- GraphicsMagick Logo
        o  M2V       *rw+ MPEG-2 Video Stream
        o  MAP       *rw- Colormap intensities and indices
        o  MAT       *r-- MATLAB image format
        o  MATTE     *-w+ MATTE format
        o  MIFF      *rw+ Magick Image File Format
        o  MNG       *rw+ Multiple-image Network Graphics
        o  MONO      *rw- Bi-level bitmap in least-significant-
                          -byte-first order
        o  MPC       -rw- Magick Persistent Cache image format
        o  MPEG      *rw+ MPEG-1 Video Stream
        o  MPG       *rw+ MPEG-1 Video Stream
        o  MSL       *r-- Magick Scripting Language
        o  MTV       *rw+ MTV Raytracing image format
        o  MVG       *rw- Magick Vector Graphics
        o  NULL      *r-- Constant image of uniform color
        o  OTB       *rw- On-the-air bitmap
        o  P7        *rw+ Xv thumbnail format
        o  PAL       *rw- 16bit/pixel interleaved YUV
        o  PALM      *rw- Palm Pixmap
        o  PBM       *rw+ Portable bitmap format (black and white)
        o  PCD       *rw- Photo CD
        o  PCDS      *rw- Photo CD
        o  PCL       *-w- Page Control Language
        o  PCT       *rw- Apple Macintosh QuickDraw/PICT
        o  PCX       *rw- ZSoft IBM PC Paintbrush
        o  PDB       *rw+ Pilot Image Format
        o  PDF       *rw+ Portable Document Format
        o  PFA       *r-- TrueType font
        o  PFB       *r-- TrueType font
        o  PGM       *rw+ Portable graymap format (gray scale)
        o  PGX       *r-- JPEG-2000 VM Format
        o  PICON     *rw- Personal Icon
        o  PICT      *rw- Apple Macintosh QuickDraw/PICT
        o  PIX       *r-- Alias/Wavefront RLE image format
        o  PLASMA    *r-- Plasma fractal image
        o  PNG       *rw- Portable Network Graphics
        o  PNG24     *rw- Portable Network Graphics, 24 bit RGB
                          opaque only
        o  PNG32     *rw- Portable Network Graphics, 32 bit RGBA
                          semitransparency OK
        o  PNG8      *rw- Portable Network Graphics, 8-bit
                          indexed, binary transparency only
        o  PNM       *rw+ Portable anymap
        o  PPM       *rw+ Portable pixmap format (color)
        o  PREVIEW   *-w- Show a preview an image enhancement,
                          effect, or f/x
        o  PS        *rw+ Adobe PostScript
        o  PS2       *-w+ Adobe Level II PostScript
        o  PS3       *-w+ Adobe Level III PostScript
        o  PSD       *rw- Adobe Photoshop bitmap
        o  PTIF      *rw- Pyramid encoded TIFF
        o  PWP       *r-- Seattle Film Works
        o  RAS       *rw+ SUN Rasterfile
        o  RGB       *rw+ Raw red, green, and blue samples (8, 16
                          or 32 bits, depending on the image depth)
        o  RGBA      *rw+ Raw red, green, blue, and matte samples
                          (8, 16, or 32 bits, depending on the image
                          depth)
        o  RLA       *r-- Alias/Wavefront image
        o  RLE       *r-- Utah Run length encoded image
        o  SCT       *r-- Scitex HandShake
        o  SFW       *r-- Seattle Film Works
        o  SGI       *rw+ Irix RGB image
        o  SHTML     *-w- Hypertext Markup Language and a
                          client-side image map
        o  STEGANO   *r-- Steganographic image
        o  SUN       *rw+ SUN Rasterfile
        o  SVG       *rw+ Scalable Vector Gaphics
        o  TEXT      *rw+ Raw text
        o  TGA       *rw+ Truevision Targa image
        o  TIFF      *rw+ Tagged Image File Format
        o  TILE      *r-- Tile image with a texture
        o  TIM       *r-- PSX TIM
        o  TOPOL     *r-- TOPOL X Image
        o  TTF       *r-- TrueType font
        o  TXT       *rw+ Raw text
        o  UIL       *-w- X-Motif UIL table
        o  UYVY      *rw- 16bit/pixel interleaved YUV
        o  VDA       *rw+ Truevision Targa image
        o  VICAR     *rw- VICAR rasterfile format
        o  VID       *rw+ Visual Image Directory
        o  VIFF      *rw+ Khoros Visualization image
        o  VST       *rw+ Truevision Targa image
        o  WBMP      *rw- Wireless Bitmap (level 0) image
        o  WMF       *r-- Windows Metafile
        o  WPG       *r-- Word Perfect Graphics
        o  X         *rw- X Image
        o  XBM       *rw- X Windows system bitmap (black
                          and white)
        o  XC        *r-- Constant image uniform color
        o  XCF       *r-- GIMP image
        o  XMP       *rw- Adobe XML metadata
        o  XPM       *rw- X Windows system pixmap (color)
        o  XV        *rw+ Khoros Visualization image
        o  XWD       *rw- X Windows system window dump (color)
        o  YUV       *rw- CCIR 601 4:1:1 or 4:2:2 (8-bit only)

           Modes:
                     *    Native blob support
                     r    Read
                     w    Write
                     +    Multi-image

       Support for some  of  these  formats  require  additional  programs  or
       libraries.  README tells where to find this software.

       Note,  a  format delineated with + means that if more than one image is
       specified, it is composited into a single multi-image file. Use +adjoin
       if you want a single image produced for each frame.

       Your installation might not support all of the formats in the list.  To
       get an up-to-date listing of the formats supported by  your  particular
       configuration, run "convert -list format".

       Raw  images  are  expected  to  have  one  byte  per pixel unless gm is
       compiled in 16-bit mode or in  32-bit  mode.  Here,  the  raw  data  is
       expected  to  be  stored  two or four bytes per pixel, respectively, in
       most-significant-byte-first order.  You can tell if gm was compiled  in
       16-bit mode by typing "gm version" without any options, and looking for
       "Q:16" in the first line of output.

FILES AND FORMATS

       By default, the image format is determined by its magic  number,  i.e.,
       the  first few bytes of the file. To specify a particular image format,
       precede  the  filename  with  an  image  format  name   and   a   colon
       (i.e.ps:image)  or  specify the image type as the filename suffix.  The
       magic number takes precedence over the filename suffix and  the  prefix
       takes  precedence  over the magic number and the suffix in input files.
       The prefix takes precedence over the filename suffix in  output  files.
       To read the "built-in" formats (GRANITE, H, LOGO, NETSCAPE, PLASMA, and
       ROSE) use a prefix (including the colon) without a filename or  suffix.
       To read the XC format, follow the colon with a color specification.  To
       read the CAPTION format, follow the colon with a text string or with  a
       filename prefixed with the at symbol (@).

       When  you  specify  X  as  your  image  type,  the filename has special
       meaning. It specifies an X window by id, name, or root. If no  filename
       is  specified,  the  window  is  selected  by clicking the mouse in the
       desired window.

       Specify input_file as -  for  standard  input,  output_file  as  -  for
       standard  output.   If input_file has the extension .Z or .gz, the file
       is uncompressed with uncompress or gunzip respectively.  If output_file
       has the extension .Z or .gz, the file is compressed using with compress
       or gzip respectively.

       Finally, when running on platforms that allow  it,  precede  the  image
       file  name  with | to pipe to or from a system command (this feature is
       not available on VMS, Win32 and Macintosh platforms). Use  a  backslash
       or quotation marks to prevent your shell from interpreting the |.

       Use  an optional index enclosed in brackets after an input file name to
       specify a desired subimage of  a  multi-resolution  image  format  like
       Photo  CD  (e.g.  "img0001.pcd[4]")  or  a  range for MPEG images (e.g.
       "video.mpg[50-75]"). A subimage specification  can  be  disjoint  (e.g.
       "image.tiff[2,7,4]").  For  raw  images,  specify  a  subimage  with  a
       geometry (e.g. -size 640x512 "image.rgb[320x256+50+50]").  Surround the
       image name with quotation marks to prevent your shell from interpreting
       the square brackets.  Single images are written with the  filename  you
       specify.  However,  multi-part  images  (e.g.,  a multi-page PostScript
       document with +adjoin specified) are written with the filename followed
       by  a  period (.) and the scene number. You can change this behavior by
       embedding a %d format specification in the file name. For example,

           image%02d.miff

       writes  files  image00.miff,   image01.miff,   etc.   Only   a   single
       specification  is  allowed  within an output filename. If more than one
       specification is present, it will be ignored.

       When running a commandline utility, you can prepend an at sign @  to  a
       filename  to  read  a  list  of image filenames from that file. This is
       convenient in the event you have too many image filenames to fit on the
       command line.

OPTIONS

       Options  are processed in command line order. Any option you specify on
       the command line remains in effect for the set of images that  follows,
       until  the  set is terminated by the appearance of any option or -noop.
       Some options only affect the decoding of images  and  others  only  the
       encoding.  The latter can appear after the final group of input images.

       This  is  a  combined  list  of  the  commandline  options  used by the
       GraphicsMagick  utilities  (animate,   compare,   composite,   convert,
       display, identify, import, mogrify and montage).

       In  this  document,  angle  brackets ("<>") enclose variables and curly
       brackets  ("{}")  enclose  optional  parameters.  For  example,  "-fuzz
       <distance>{%}" means you can use the option "-fuzz 10" or "-fuzz 2%".

       -adjoin
              join images into a single multi-image file

              By  default,  all  images of an image sequence are stored in the
              same file. However, some formats (e.g. JPEG) do not support more
              than  one  image and are saved to separate files. Use +adjoin to
              force this behavior.

       -affine <matrix>
              drawing transform matrix

              This option provides a transform matrix {sx,rx,ry,sy,tx,ty}  for
              use by subsequent -draw or -transform options.

       -antialias
              remove pixel aliasing

              By default antialiasing algorithms are used when drawing objects
              (e.g.  lines)  or  rendering  vector  formats  (e.g.   WMF   and
              Postscript).  Use  +antialias  to  disable  use  of antialiasing
              algorithms. Reasons to  disable  antialiasing  include  avoiding
              increasing colors in the image, or improving rendering speed.

       -append
              append a set of images

              This  option  creates  a  single  image  where the images in the
              original set are stacked top-to-bottom.  If they are not of  the
              same  width, any narrow images will be expanded to fit using the
              background color.  Use +append to  stack  images  left-to-right.
              The set of images is terminated by the appearance of any option.
              If the -append option appears after all of the input images, all
              images are appended.

        -asc-cdl <spec>
              apply ASC CDL color transform

              Applies  ("bakes  in")  the  ASC  CDL, which is a format for the
              exchange of basic  primary  color  grading  information  between
              equipment  and software from different manufacturers. The format
              defines the math for three functions: slope, offset  and  power.
              Each  function  uses a number for the red, green, and blue color
              channels for a total of nine numbers comprising a  single  color
              decision.   The   tenth  number  (optional)  is  for  chromiance
              (saturation) as specified by ASC CDL 1.2.

              The argument string is comma delimited and is in  the  following
              form (but without invervening spaces or line breaks)

                redslope,redoffset,redpower:
                greenslope,greenoffset,greenpower:
                blueslope,blueoffset,bluepower:
                saturation

              with    the    unity    (no    change)    specification   being:
              "1.0,0.0,1.0:1.0,0.0,1.0:1.0,0.0,1.0:1.0"

       -authenticate <string>
              decrypt image with this password

              Use this option to supply a password for decrypting an image  or
              an image sequence, if it is being read from a format such as PDF
              that supports encryption.  Encrypting images  being  written  is
              not supported.

       -average
              average a set of images

              The set of images is terminated by the appearance of any option.
              If the -average option appears after all of  the  input  images,
              all images are averaged.

       -backdrop
              display the image centered on a backdrop.

              This backdrop covers the entire workstation screen and is useful
              for hiding other X window activity while viewing the image.  The
              color  of the backdrop is specified as the foreground color (X11
              default is black).  Refer to "X Resources", below, for details.

       -background <color>
              the background color

              The color is specified using  the  format  described  under  the
              -fill option.

       -black-threshold red[,green][,blue][,opacity]
              pixels below the threshold become black

              Use  -black-threshold  to  set  pixels  with  values  below  the
              specified threshold to minimum value (black). If only one  value
              is  supplied,  or the red, green, and blue values are identical,
              then intensity thresholding is  used.  If  the  color  threshold
              values  are  not  identical  then  channel-based thresholding is
              used, and color distortion will occur. Specify a negative  value
              (e.g. -1) if you want a channel to be ignored but you do want to
              threshold a channel later in the list. If a percent  (%)  symbol
              is  appended,  then  the  values  are treated as a percentage of
              maximum range.

       -blue-primary <x>,<y>
              blue chromaticity primary point

       -blur <radius>{x<sigma>}
              blur the image with a Gaussian operator

              Blur with the given radius and standard deviation (sigma).

       -border <width>x<height>
              surround the image with a border of color

              See -geometry for details about the geometry specification.

       -bordercolor <color>
              the border color

              The color is specified using  the  format  described  under  the
              -fill option.

       -borderwidth <geometry>
              the border width

       -box <color>
              set the color of the annotation bounding box

              The  color  is  specified  using  the format described under the
              -fill option.

              See -draw for further details.

       -channel <type>
              the type of channel

              Choose from: Red, Green, Blue, Opacity,  Matte,  Cyan,  Magenta,
              Yellow, Black, or Gray.

              Use  this option to extract a particular channel from the image.
              Opacity, for example,  is  useful  for  extracting  the  opacity
              values from an image.

       -charcoal <factor>
              simulate a charcoal drawing

       -chop <width>x<height>{+-}<x>{+-}<y>{%}
              remove pixels from the interior of an image

              Width  and height give the number of columns and rows to remove,
              and x and y are offsets that give the location of  the  leftmost
              column and topmost row to remove.

              The  x  offset normally specifies the leftmost column to remove.
              If the -gravity option  is  present  with  NorthEast,  East,  or
              SouthEast gravity, it gives the distance leftward from the right
              edge of the image to the rightmost column to remove.  Similarly,
              the  y  offset normally specifies the topmost row to remove, but
              if the -gravity option is  present  with  SouthWest,  South,  or
              SouthEast  gravity,  it  specifies  the distance upward from the
              bottom edge of the image to the bottom row to remove.

              The -chop option removes entire rows and columns, and moves  the
              remaining corner blocks leftward and upward to close the gaps.

       -clip  apply the clipping path, if one is present

              If  a clipping path is present, it will be applied to subsequent
              operations.

              For example, if you type the following command:

                   gm convert -clip -negate cockatoo.tif negated.tif

              only the pixels within the clipping path are negated.

              The -clip feature requires the XML library.  If the XML  library
              is not present, the option is ignored.

       -coalesce
              merge a sequence of images

              Each  image N in the sequence after Image 0 is replaced with the
              image created by flattening images 0 through N.

              The set of images is terminated by the appearance of any option.
              If  the  -coalesce option appears after all of the input images,
              all images are coalesced.

       -colorize <value>
              colorize the image with the pen color

              Specify the amount of colorization  as  a  percentage.  You  can
              apply  separate  colorization values to the red, green, and blue
              channels of the image with a colorization value  list  delimited
              with slashes (e.g. 0/0/50).

              The  -colorize  option may be used in conjunction with -modulate
              to produce a nice sepia toned image like:

                gm convert input.ppm -modulate 115,0,100 \
                   -colorize 7,21,50 output.ppm.

       -colormap <type>
              define the colormap type

              Choose between shared or private.

              This option only applies when the default  X  server  visual  is
              PseudoColor  or GRAYScale. Refer to -visual for more details. By
              default, a shared colormap is allocated. The image shares colors
              with  other X clients.  Some image colors could be approximated,
              therefore your image may  look  very  different  than  intended.
              Choose  Private  and the image colors appear exactly as they are
              defined. However, other clients  may  go  technicolor  when  the
              image colormap is installed.

       -colors <value>
              preferred number of colors in the image

              The  actual  number of colors in the image may be less than your
              request, but never more. Note, this is a color reduction option.
              Images  with  less unique colors than specified with this option
              will have any duplicate or unused colors removed.  The  ordering
              of  an existing color palette may be altered. When converting an
              image from color to grayscale, convert the  image  to  the  gray
              colorspace  before  reducing the number of colors since doing so
              is most efficient. Refer to <a href="quantize.html">quantize for
              more details.

              Note,  options  -dither,  -colorspace, and -treedepth affect the
              color reduction algorithm.

       -colorspace <value>
              the type of colorspace

              Choices  are:  CineonLog,  CMYK,  GRAY,  HSL,  HWB,  OHTA,  RGB,
              Rec601Luma,  Rec709Luma,  Rec601YCbCr, Rec709YCbCr, Transparent,
              XYZ, YCbCr, YIQ, YPbPr, or YUV.

              Color reduction, by default, takes place in the RGB color space.
              Empirical  evidence suggests that distances in color spaces such
              as YUV or YIQ correspond to perceptual  color  differences  more
              closely  than do distances in RGB space.  These color spaces may
              give better results when color  reducing  an  image.   Refer  to
              quantize  for more details.  Two gray colorspaces are supported.
              The Rec601Luma space is based on the recommendations for  legacy
              NTSC television (ITU-R BT.601-5).  The Rec709Luma space is based
              on the recommendations for HDTV (Rec.  ITU-R  BT.709-5)  and  is
              suitable  for  suitable  for use with computer graphics, and for
              contemporary CRT displays. The GRAY colorspace currently selects
              the  Rec601Luma  colorspace  by default for backwards compatibly
              reasons. This default may be re-considered in the future.

              Two YCbCr colorspaces are supported. The  Rec601YCbCr  space  is
              based  on  the recommendations for legacy NTSC television (ITU-R
              BT.601-5). The Rec709CbCr space is based on the  recommendations
              for HDTV (Rec.  ITU-R BT.709-5) and is suitable for suitable for
              use with computer graphics, and for contemporary  CRT  displays.
              The YCbCr colorspace specification is equivalent toRec601YCbCr.

              The   Transparent  color  space  behaves  uniquely  in  that  it
              preserves the matte channel of the image if it exists.

              The -colors or -monochrome option, or saving to  a  file  format
              which  requires  color reduction, is required for this option to
              take effect.

       -comment <string>
              annotate an image with a comment

              Use this option to assign a specific comment to the image,  when
              writing  to  an  image  format  that  supports comments. You can
              include the image filename, type, width, height, or other  image
              attribute  by  embedding  special format characters listed under
              the -format option.  The comment is not drawn on the image,  but
              is  embedded  in  the  image  datastream  via a "Comment" tag or
              similar mechanism.  If you want the comment to be visible on the
              image itself, use the -draw option.

              For example,

                   -comment "%m:%f %wx%h"

              produces an image comment of MIFF:bird.miff 512x480 for an image
              titled bird.miff and whose width is 512 and height is 480.

              If the first character of string is @, the image comment is read
              from a file titled by the remaining characters in the string.

       -compose <operator>
              the type of image composition

              The  description  of  composition  uses  abstract terminology in
              order to allow the the  description  to  be  more  clear,  while
              avoiding  constant  values  which  are  specific to a particular
              build configuration. Each image pixel  is  represented  by  red,
              green,  and  blue  levels  (which  are  equal for a gray pixel).
              MaxRGB is the maximum integral value which may be stored in  the
              red,  green, or blue channels of the image. Each image pixel may
              also optionally (if the image matte channel is enabled) have  an
              associated   level   of   opacity   (ranging   from   opaque  to
              transparent), which may be used to determine  the  influence  of
              the  pixel  color  when compositing the pixel with another image
              pixel. If the image matte channel is disabled, then  all  pixels
              in  the  image  are  treated  as opaque.  The color of an opaque
              pixel is fully visible while the color of  a  transparent  pixel
              color is entirely absent (pixel color is ignored).

              By definition, raster images have a rectangular shape. All image
              rows are of equal length, and all image columns  have  the  same
              number  of  rows.  By  treating  the opacity channel as a visual
              "mask" the rectangular image may be given a "shape" by  treating
              the  opacity  channel  as  a cookie-cutter for the image. Pixels
              within the shape are opaque, while pixels outside the shape  are
              transparent.  Pixels on the boundary of the shape may be between
              opaque  and  transparent  in  order  to   provide   antialiasing
              (visually  smooth  edges).  The  description  of the composition
              operators use this concept of image "shape" in order to make the
              description  of  the operators easier to understand. While it is
              convenient to describe the operators in terms of  "shapes"  they
              are  by no means limited to mask-style operations since they are
              based  on  continuous  floating-point  mathematics  rather  than
              simple boolean operations.

              By  default,  the Over composite operator is used. The following
              composite operators are available:

                   Over
                   In
                   Out
                   Atop
                   Xor
                   Plus
                   Minus
                   Add
                   Subtract
                   Difference
                   Divide
                   Multiply
                   Bumpmap
                   Copy
                   CopyRed
                   CopyGreen
                   CopyBlue
                   CopyOpacity
                   CopyCyan
                   CopyMagenta
                   CopyYellow
                   CopyBlack

              The behavior of each operator is described below.

               Over

                    The result will be the union of the two image shapes, with
                    opaque  areas  of change-image obscuring base-image in the
                    region of overlap.

               In

                    The result is simply change-image  cut  by  the  shape  of
                    base-image.  None  of the image data of base-image will be
                    in the result.

               Out

                    The resulting image is  change-image  with  the  shape  of
                    base-image cut out.

               Atop

                    The  result  is the same shape as base-image, with change-
                    image obscuring base-image where the image shapes overlap.
                    Note this differs from over because the portion of change-
                    image outside base-image's shape does not  appear  in  the
                    result.

               Xor

                    The  result  is  the image data from both change-image and
                    base-image that is outside the overlap region. The overlap
                    region will be blank.

               Plus

                    The  result  is  just  the  sum  of the image data. Output
                    values are cropped to MaxRGB (no overflow). This operation
                    is independent of the matte channels.

               Minus

                    The  result  of  change-image - base-image, with underflow
                    cropped to zero. The matte  channel  is  ignored  (set  to
                    opaque, full coverage).

               Add

                    The  result  of  change-image  + base-image, with overflow
                    wrapping around (mod MaxRGB+1).

               Subtract

                    The result of change-image -  base-image,  with  underflow
                    wrapping  around  (mod  MaxRGB+1).  The  add  and subtract
                    operators   can   be   used    to    perform    reversible
                    transformations.

               Difference

                    The  result  of  abs(change-image  -  base-image). This is
                    useful for comparing two very similar images.

               Divide

                    The result of change-image / base-image.  This  is  useful
                    for   improving   the  readability  of  text  on  unevenly
                    illuminated photos (by using a gaussian  blurred  copy  of
                    change-image as base-image).

               Multiply

                    The  result  of  change-image * base-image. This is useful
                    for the creation of drop-shadows.

               Bumpmap

                    The result base-image shaded by change-image.

               Copy

                    The resulting image is base-image  replaced  with  change-
                    image. Here the matte information is ignored.

               CopyRed

                    The  resulting  image  is  the  red  channel in base-image
                    replaced with the red channel in change-image.  The  other
                    channels are copied untouched.

               CopyGreen

                    The  resulting  image  is  the green channel in base-image
                    replaced with the green channel in change-image. The other
                    channels are copied untouched.

               CopyBlue

                    The  resulting  image  is  the  blue channel in base-image
                    replaced with the blue channel in change-image. The  other
                    channels are copied untouched.

               CopyOpacity

                    The  resulting  image is the opacity channel in base-image
                    replaced with the opacity  channel  in  change-image.  The
                    other channels are copied untouched.

               CopyCyan

                    The  resulting  image  is  the  cyan channel in base-image
                    replaced with the cyan channel in change-image. The  other
                    channels  are  copied  untouched.  Use  of  this  operator
                    requires that base-image be in CMYK(A) colorspace.

               CopyMagenta

                    The resulting image is the magenta channel  in  base-image
                    replaced  with  the  magenta  channel in change-image. The
                    other channels are copied untouched. Use of this  operator
                    requires that base-image be in CMYK(A) colorspace.

               CopyYellow

                    The  resulting  image  is the yellow channel in base-image
                    replaced with the  yellow  channel  in  change-image.  The
                    other  channels are copied untouched. Use of this operator
                    requires that base-image be in CMYK(A) colorspace.

               CopyBlack

                    The resulting image is the  black  channel  in  base-image
                    replaced with the black channel in change-image. The other
                    channels  are  copied  untouched.  Use  of  this  operator
                    requires  that  base-image  be  in  CMYK(A) colorspace. If
                    change-image is not in CMYK space, then  the  change-image
                    pixel intensities are used.

       -compress <type>
              the type of image compression

              Choices  are:  None, BZip, Fax, Group4, JPEG, Lossless, LZW, RLE
              or Zip.

              Specify +compress to store the binary image in  an  uncompressed
              format.   The  default  is the compression type of the specified
              image file.

              "Lossless" refers to lossless JPEG, which is only  available  if
              the JPEG library has been patched to support it. Use of lossless
              JPEG is generally not recommended.

              Use the -quality option to set the compression level to be  used
              by  JPEG, PNG, MIFF, and MPEG encoders. Use the -sampling-factor
              option to set the sampling factor to be used by the  DPX,  JPEG,
              MPEG, and YUV encoders for downsampling the chroma channels.

       -contrast
              enhance or reduce the image contrast

              This  option  enhances  the  intensity  differences  between the
              lighter and darker elements  of  the  image.  Use  -contrast  to
              enhance the image or +contrast to reduce the image contrast.

              For a more pronounced effect you can repeat the option:

                  gm convert rose: -contrast -contrast rose_c2.png

       -convolve <kernel>
              convolve image with the specified convolution kernel

              The  kernel  is  specified as a comma-separated list of floating
              point values, ordered left-to right, starting with the top  row.
              The  order of the kernel is determined by the square root of the
              number of entries.  Presently only square kernels are supported.

       -create-directories
              create output directory if required

              Use this  option  with  -output-directory  if  the  input  paths
              contain  subdirectories  and  it  is  desired  to create similar
              subdirectories in the output directory.   Without  this  option,
              mogrify  will  fail  if  the  required output directory does not
              exist.

       -crop <width>x<height>{+-}<x>{+-}<y>{%}
              preferred size and location of the cropped image

              See -geometry for details about the geometry specification.

              The width and height give the size of  the  image  that  remains
              after  cropping,  and x and y are offsets that give the location
              of the top left corner of the cropped image with respect to  the
              original image.  To specify the amount to be removed, use -shave
              instead.

              If the x and y offsets are present, a single image is generated,
              consisting  of the pixels from the cropping region.  The offsets
              specify the location of the upper left corner  of  the  cropping
              region measured downward and rightward with respect to the upper
              left corner of the image.  If the  -gravity  option  is  present
              with  NorthEast,  East,  or  SouthEast  gravity,  it  gives  the
              distance leftward from the right edge of the image to the  right
              edge  of the cropping region.  Similarly, if the -gravity option
              is present with SouthWest,  South,  or  SouthEast  gravity,  the
              distance is measured upward between the bottom edges.

              If  the  x  and  y  offsets  are  omitted, a set of tiles of the
              specified  geometry,  covering  the  entire  input   image,   is
              generated.  The rightmost tiles and the bottom tiles are smaller
              if the specified geometry extends beyond the dimensions  of  the
              input image.

       -cycle <amount>
              displace image colormap by amount

              Amount  defines  the  number  of  positions  each colormap entry
              isshifted.

       -debug <events>
              enable debug printout

              The events parameter specifies which events are  to  be  logged.
              It can be either None, All, or a comma-separated list consisting
              of one or more of the following domains: Annotate, Blob,  Cache,
              Coder,   Configure,   Deprecate,   Error,   Exception,   Locale,
              Render,Resource,  TemporaryFile,  Transform,  Warning,  X11,  or
              User.  For example, to log cache and blob events, use

                  gm convert -debug "Cache,Blob" rose: rose.png

              The  "User"  domain  is  normally  empty, but developers can log
              "User" events in their private copy of GraphicsMagick.

              Use the -log option to specify the format for debugging output.

              Use +debug to turn off all logging.

              An alternative to  using  -debug  is  to  use  the  MAGICK_DEBUG
              environment  variable.  The  allowed values for the MAGICK_DEBUG
              environment variable are the same as for the -debug option.

       -deconstruct
              break down an image sequence into constituent parts

              This option compares each image with the next in a sequence  and
              returns  the maximum bounding region of any pixel differences it
              discovers.  This method can undo a coalesced  sequence  returned
              by  the  -coalesce  option, and is useful for removing redundant
              information from a GIF or MNG animation.

              The sequence of images is terminated by the  appearance  of  any
              option.   If  the  -deconstruct  option appears after all of the
              input images, all images are deconstructed.

       -define <key>{=<value>},...
              add coder/decoder specific options This option  creates  one  or
              more  definitions  for  coders and decoders to use while reading
              and writing image data. Definitions may be passed to coders  and
              decoders  to  control options that are specific to certain image
              formats. If value is missing for a definition,  an  empty-valued
              definition  of  a  flag  will be created with that name. This is
              used to control on/off options. Use +define <key>,... to  remove
              definitions  previously  created.  Use +define "*" to remove all
              existing definitions.

              The following definitions may be created:

               cineon:colorspace={rgb|cineonlog}

                    Use the cineon:colorspace option  when  reading  a  Cineon
                    file  to specify the colorspace the Cineon file uses. This
                    overrides the colorspace type implied by  the  DPX  header
                    (if any).

               dpx:bits-per-sample=<value>

                    If  the dpx:bits-per-sample key is defined, GraphicsMagick
                    will write DPX images with the specified bits per  sample,
                    overriding any existing depth value. If this option is not
                    specified, then the value is based on the  existing  image
                    depth value from the original image file. The DPX standard
                    supports bits per sample values of 1, 8, 10, 12,  and  16.
                    Many DPX readers demand a sample size of 10 bits with type
                    A padding (see below).

               dpx:colorspace={rgb|cineonlog}

                    Use the dpx:colorspace option when reading a DPX  file  to
                    specify  the  colorspace the DPX file uses. This overrides
                    the colorspace type implied by the DPX header (if any).

               dpx:packing-method={packed|a|b|lsbpad|msbpad}

                    DPX samples are output within 32-bit words.  They  may  be
                    tightly  packed  end-to-end  within  the words ("packed"),
                    padded with null bits to the right of the sample  ("a"  or
                    "lsbpad),  or  padded  with  null  bits to the left of the
                    sample ("b" or "msbpad"). This option only has  an  effect
                    for  sample  sizes  of  10  or 12 bits. If samples are not
                    packed, the DPX standard recommends type A  padding.  Many
                    DPX  readers  demand  a sample size of 10 bits with type A
                    padding.

               dpx:pixel-endian={lsb|msb}

                    Allows the user to specify the endian order of the  pixels
                    when  reading  or writing the DPX files. Sometimes this is
                    useful if the file is (or must be) written incorrectly  so
                    that   the  file  header  and  the  pixels  use  different
                    endianness.

               dpx:swap-samples={true|false}

                    GraphicsMagick strives to adhere to the DPX  standard  but
                    certain aspects of the standard can be quite confusing. As
                    a  result,  some  10-bit  DPX  files  have  Red  and  Blue
                    interchanged,   or  Cb  and  Cr  interchanged  due  to  an
                    different interpretation of the standard, or  getting  the
                    wires  crossed.  The  swap-samples  option may be supplied
                    when reading or writing in order to read  or  write  using
                    the necessary sample order.

               jp2:rate=<value>

                    Specify  the  compression  factor  to  use  while  writing
                    JPEG-2000 files. The compression factor is the  reciprocal
                    of  the  compression ratio. The valid range is 0.0 to 1.0,
                    with 1.0 indicating lossless compression. If defined, this
                    value  overrides the -quality setting. The default quality
                    setting of 75 results in a rate value of 0.06641.

               jpeg:block-smoothing={true|false}

                    Enables or disables block smoothing when  reading  a  JPEG
                    file (default enabled).

               jpeg:dct-method=<value>

                    Selects  the  IJG  JPEG library DCT implementation to use.
                    The encoding implementations vary in  speed  and  encoding
                    error.  The  available choices for value are islow, ifast,
                    float, default and fastest. Note that  fastest  might  not
                    necessarily  be  fastest  on  your  CPU,  depending on the
                    choices made when the JPEG library was built and how  your
                    CPU behaves.

               jpeg:fancy-upsampling={true|false}

                    Enables  or  disables fancy upsampling when reading a JPEG
                    file (default enabled).

               jpeg:optimize-coding={true|false}

                    Selects  if  huffman  encoding  should  be  used.  Huffman
                    encoding  is  enabled  by default, but may be disabled for
                    very large images since  it  encoding  requires  that  the
                    entire  image  be  buffered  in  memory.  Huffman encoding
                    produces smaller  JPEG  files  at  the  expense  of  added
                    compression time and memory consumption.

               jpeg:preserve-settings

                    If  the  jpeg:preserve-settings  flag is defined, the JPEG
                    encoder will use the same "quality" and  "sampling-factor"
                    settings  that  were found in the input file, if the input
                    was in JPEG format. These settings are also  preserved  if
                    the input is a JPEG file and the output is a JNG file.  If
                    the colorspace of the output file differs from that of the
                    input  file,  the  quality  setting  is  preserved but the
                    sampling-factors are not.

               ps:imagemask

                    If the ps:imagemask flag is  defined,  the  PS3  and  EPS3
                    coders  will  create  Postscript files that render bilevel
                    images with the Postscript imagemask operator  instead  of
                    the image operator.

               tiff:alpha={unspecified|associated|unassociated}

                    Specify  the  TIFF  alpha  channel  type  when  reading or
                    writing TIFF  files,  overriding  the  normal  value.  The
                    default  alpha  channel  type  for new files is associated
                    alpha.  Existing  alpha  settings   are   preserved   when
                    converting from one TIFF file to another. When a TIFF file
                    uses associated alpha, the image pixels are pre-multiplied
                    (i.e.   altered)   with  the  alpha  channel.  Files  with
                    "associated" alpha appear as if they were alpha composited
                    on  a black background when the matte channel is disabled.
                    If the unassociated alpha type is selected, then the alpha
                    channel  is  saved  without altering the pixels. Photoshop
                    recognizes associated alpha as  transparency  information,
                    if  the  file  is saved with unassociated alpha, the alpha
                    information is loaded as  an  independent  channel.   Note
                    that for many years, ImageMagick and GraphicsMagick marked
                    TIFF files as using  associated  alpha,  without  properly
                    pre-multiplying the pixels.

               tiff:fill-order={msb2lsb|lsb2msb}

                    If the tiff:fill-order key is defined, GraphicsMagick will
                    use it to determine the bit fill order used while  writing
                    TIFF files. The normal default is "msb2lsb", which matches
                    the  native  bit  order  of  all  modern  CPUs.  The  only
                    exception to this is when Group3 or Group4 FAX compression
                    is requested since FAX machines send data in  bit-reversed
                    order  and  therefore  RFC  2301  recommends using reverse
                    order.

               tiff:sample-format={unsigned|ieeefp}

                    If the tiff:sample-format key is  defined,  GraphicsMagick
                    will  use  it  to  determine  the sample format used while
                    writing TIFF files. The  default  is  "unsigned".  Specify
                    "ieeefp"  in order to write floating-point TIFF files with
                    float  (32-bit)  or  double  (64-bit)  values.   Use   the
                    tiff:bits-per-sample  define  to  determine  the  type  of
                    floating-point value to use.

               tiff:max-sample-value=<value>

                    If   the    tiff:max-sample-value    key    is    defined,
                    GraphicsMagick  will use the assigned value as the maximum
                    floating  point  value  while  reading  or  writing   IEEE
                    floating  point  TIFFs. Otherwise the maximum value is 1.0
                    or the value obtained from the file's SMaxSampleValue  tag
                    (if  present).  The  floating  point data is currently not
                    scanned in advance to  determine  a  best  maximum  sample
                    value  so  if the range is not 1.0, or the SMaxSampleValue
                    tag is not present, it may be necessary to (intelligently)
                    use this parameter to properly read a file.

               tiff:min-sample-value=<value>

                    If    the    tiff:min-sample-value    key    is   defined,
                    GraphicsMagick will use the assigned value as the  minimum
                    floating   point  value  while  reading  or  writing  IEEE
                    floating point TIFFs. Otherwise the minimum value  is  0.0
                    or  the value obtained from the file's SMinSampleValue tag
                    (if present).

               tiff:bits-per-sample=<value>

                    If the tiff:bits-per-sample key is defined, GraphicsMagick
                    will  write  images  with  the  specified bits per sample,
                    overriding any existing depth value. Value may be  any  in
                    the  range  of  1 to 32, or 64 when the default ´unsigned'
                    format is written, or  16/32/24/64  if  IEEEFP  format  is
                    written.    Please   note   that  the  baseline  TIFF  6.0
                    specification only  requires  readers  to  handle  certain
                    powers  of two, and the values to be handled depend on the
                    nature of the image  (e.g.  colormapped,  grayscale,  RGB,
                    CMYK).

               tiff:samples-per-pixel=<value>

                    If  the  tiff:samples-per-pixel key is defined to a value,
                    the TIFF coder will write TIFF  images  with  the  defined
                    samples  per  pixel,  overriding  any  value stored in the
                    image. This option should not normally be used.

               tiff:rows-per-strip=<value>

                    Allows the user to specify the number  of  rows  per  TIFF
                    strip.   Rounded  up  to  a multiple of 16 when using JPEG
                    compression. Ignored when using tiles.

               tiff:strip-per-page=true

                    Requests that the image is written in a single TIFF strip.
                    This  is  normally  the  default  when  group3  or  group4
                    compression  is  requested   within   reasonable   limits.
                    Requesting  a  single strip for large images may result in
                    failure due to  resource  consumption  in  the  writer  or
                    reader.

               tiff:tile

                    Enable writing tiled TIFF (rather than stripped) using the
                    default tile size. Tiled TIFF organizes the  image  as  an
                    array  of smaller images (tiles) in order to enable random
                    access.

               tiff:tile-geometry=<width>x<height>

                    Specify the tile size to use  while  writing  tiled  TIFF.
                    Width  and height should be a multiple of 16. If the value
                    is not a multiple of 16, then it  will  be  rounded  down.
                    Enables  tiled  TIFF  if  it has not already been enabled.
                    GraphicsMagick does not use tiled  storage  internally  so
                    tiles  need  to  be  converted  back  and  forth  from the
                    internal  scanline-oriented   storage   to   tile-oriented
                    storage. Testing with typical RGB images shows that useful
                    square tile size values range from 128x128  to  1024x1024.
                    Large  images which require using a disk-based pixel cache
                    benefit from large tile sizes while images  which  fit  in
                    memory work well with smaller tile sizes.

               tiff:tile-width=<width>

                    Specify  the  tile  width to use while writing tiled TIFF.
                    The tile height is then defaulted to an appropriate  size.
                    Width  should  be  a multiple of 16. If the value is not a
                    multiple of 16, then it will  be  rounded  down.   Enables
                    tiled TIFF if it has not already been enabled.

               tiff:tile-height=<height>

                    Specify  the  tile height to use while writing tiled TIFF.
                    The tile width is then defaulted to an  appropriate  size.
                    Height  should  be a multiple of 16. If the value is not a
                    multiple of 16, then it will  be  rounded  down.   Enables
                    tiled TIFF if it has not already been enabled.

               For  example, to create a postscript file that will render only
               the black pixels of a bilevel image, use:

                   gm convert bilevel.tif -define ps:imagemask eps3:stencil.ps

       -delay <1/100ths of a second>
              display the next image after pausing

              This option is useful for  regulating  the  animation  of  image
              sequences  Delay/100  seconds  must expire before the display of
              the next image. The default is no delay between each showing  of
              the image sequence. The maximum delay is 65535.

              You  can  specify  a delay range (e.g. -delay 10-500) which sets
              the minimum and maximum delay.

       -density <width>x<height>
              horizontal and vertical resolution in pixels of the  image  This
              option  specifies the image resolution to store while encoding a
              raster image or the canvas resolution while rendering  (reading)
              vector  formats  such  as  Postscript,  PDF, WMF, and SVG into a
              raster image. Image resolution provides the unit of  measure  to
              apply  when  rendering  to an output device or raster image. The
              default unit of measure is in dots per inch  (DPI).  The  -units
              option may be used to select dots per centimeter instead.
               The default resolution is 72 dots per inch, which is equivalent
              to one point per  pixel  (Macintosh  and  Postscript  standard).
              Computer  screens  are  normally  72  or  96 dots per inch while
              printers typically support 150, 300, 600, or 1200 dots per inch.
              To  determine  the  resolution  of  your display, use a ruler to
              measure the width of your screen in inches, and  divide  by  the
              number  of  horizontal  pixels (1024 on a 1024x768 display).  If
              the file format supports it, this option may be used  to  update
              the  stored  image  resolution.  Note  that Photoshop stores and
              obtains image resolution from a proprietary embedded profile. If
              this profile is not stripped from the image, then Photoshop will
              continue  to  treat  the  image  using  its  former  resolution,
              ignoring  the  image  resolution  specified in the standard file
              header.  The density option is an attribute and does  not  alter
              the  underlying  raster  image.  It  may  be  used to adjust the
              rendered size for desktop publishing purposes by  adjusting  the
              scale  applied  to the pixels. To resize the image so that it is
              the same size at  a  different  resolution,  use  the  -resample
              option.

       -depth <value>
              depth of the image

              This  is  the  number of bits of color to preserve in the image.
              Any value between 1  and  QuantumDepth  (build  option)  may  be
              specified, although 8 or 16 are the most common values. Use this
              option to specify the depth of raw images whose depth is unknown
              such  as GRAY, RGB, or CMYK, or to change the depth of any image
              after it has been read.  The depth  option  is  applied  to  the
              pixels  immediately  so  it  may  be  used  as  a form of simple
              compression by discarding the least significant  bits.  Reducing
              the  depth  in advance may speed up color quantization, and help
              create smaller file sizes when  using  a  compression  algorithm
              like LZW or ZIP.

       -descend
              obtain image by descending window hierarchy

       -despeckle
              reduce the speckles within an image

       -displace <horizontal scale>x<vertical scale>
              shift image pixels as defined by a displacement map

              With this option, composite image is used as a displacement map.
              Black, within  the  displacement  map,  is  a  maximum  positive
              displacement.   White  is  a  maximum  negative displacement and
              middle gray is neutral.  The displacement is scaled to determine
              the  pixel  shift.  By default, the displacement applies in both
              the horizontal and vertical directions.  However, if you specify
              mask,  composite image is the horizontal X displacement and mask
              the vertical Y displacement.

       -display <host:display[.screen]>
              specifies the X server to contact

              This option is used with convert for  obtaining  image  or  font
              from this X server.  See X(1).

       -dispose <method>
              GIF disposal method

              The Disposal Method indicates the way in which the graphic is to
              be treated after being displayed.

              Here are the valid methods:

                  Undefined       No disposal specified.
                  None            Do not dispose between frames.
                  Background      Overwrite the image area with
                                  the background color.
                  Previous        Overwrite the image area with
                                  what was there prior to rendering
                                  the image.

       -dissolve <percent>
              dissolve an image into another by the given percent

              The opacity of the composite image is multiplied  by  the  given
              percent, then it is composited over the main image.

       -dither
              apply Floyd/Steinberg error diffusion to the image

              The basic strategy of dithering is to trade intensity resolution
              for spatial resolution by averaging the intensities  of  several
              neighboring  pixels.  Images which suffer from severe contouring
              when reducing colors can be improved with this option.

              The -colors or -monochrome option is required for this option to
              take effect.

              Use  +dither  to  turn  off  dithering  and to render PostScript
              without text or graphic aliasing. Disabling dithering often (but
              not always) leads to decreased processing time.

       -draw <string>
              annotate an image with one or more graphic primitives

              Use  this  option  to annotate an image with one or more graphic
              primitives.     The    primitives    include    shapes,    text,
              transformations, and pixel operations.  The shape primitives are

                   point           x,y
                   line            x0,y0 x1,y1
                   rectangle       x0,y0 x1,y1
                   roundRectangle  x0,y0 x1,y1 wc,hc
                   arc             x0,y0 x1,y1 a0,a1
                   ellipse         x0,y0 rx,ry a0,a1
                   circle          x0,y0 x1,y1
                   polyline        x0,y0  ...  xn,yn
                   polygon         x0,y0  ...  xn,yn
                   Bezier          x0,y0  ...  xn,yn
                   path            path specification
                   image           operator x0,y0 w,h filename

              The text primitive is

                   text            x0,y0 string

              The text gravity primitive is

                   gravity         NorthWest, North, NorthEast, West, Center,
                                   East, SouthWest, South, or SouthEast

              The  text  gravity  primitive only affects the placement of text
              and  does  not  interact  with  the  other  primitives.   It  is
              equivalent to using the -gravity commandline option, except that
              it is limited in scope to the -draw option in which it appears.

              The transformation primitives are

                   rotate          degrees
                   translate       dx,dy
                   scale           sx,sy
                   skewX           degrees
                   skewY           degrees

              The pixel operation primitives are

                   color           x0,y0 method
                   matte           x0,y0 method

              The shape primitives are drawn in the  color  specified  in  the
              preceding   -stroke  option.  Except  for  the  line  and  point
              primitives, they are filled with  the  color  specified  in  the
              preceding -fill option.  For unfilled shapes, use -fill none.

              Point requires a single coordinate.

              Line requires a start and end coordinate.

              Rectangle expects an upper left and lower right coordinate.

              RoundRectangle  has  the  upper left and lower right coordinates
              and the width and height of the corners.

              Circle has a center coordinate and a coordinate  for  the  outer
              edge.

              Use  Arc to inscribe an elliptical arc within a rectangle.  Arcs
              require a start and end point as well as the degree of  rotation
              (e.g. 130,30 200,100 45,90).

              Use  Ellipse  to  draw  a  partial ellipse centered at the given
              point with the x-axis and y-axis radius and start and end of arc
              in degrees (e.g. 100,100 100,150 0,360).

              Finally,  polyline and polygon require three or more coordinates
              to define its boundaries.  Coordinates are integers separated by
              an  optional comma.  For example, to define a circle centered at
              100,100 that extends to 150,150 use:

                   -draw 'circle 100,100 150,150'

              Paths (See Paths) represent an outline of  an  object  which  is
              defined  in  terms  of  moveto (set a new current point), lineto
              (draw a straight line), curveto (draw  a  curve  using  a  cubic
              Bezier),  arc  (elliptical or circular arc) and closepath (close
              the current  shape  by  drawing  a  line  to  the  last  moveto)
              elements.  Compound  paths  (i.e.,  a  path  with subpaths, each
              consisting of a single moveto followed by one or  more  line  or
              curve  operations)  are possible to allow effects such as "donut
              holes" in objects.

              Use image to composite an image with another image.  Follow  the
              image keyword with the composite operator, image location, image
              size, and filename:

                   -draw 'image Over 100,100 225,225 image.jpg'

              You can use 0,0 for the image  size,  which  means  to  use  the
              actual  dimensions found in the image header. Otherwise, it will
              be  scaled  to  the  given  dimensions.   See  -compose  for   a
              description of the composite operators.

              Use  text  to  annotate  an  image  with  text.  Follow the text
              coordinates with a string. If the string  has  embedded  spaces,
              enclose  it  in  single  or  double  quotes.  Optionally you can
              include the image filename, type, width, height, or other  image
              attribute  by  embedding  special format character. See -comment
              for details.

              For example,

                   -draw 'text 100,100 "%m:%f %wx%h"'

              annotates the image with MIFF:bird.miff  512x480  for  an  image
              titled bird.miff and whose width is 512 and height is 480.

              If  the  first character of string is @, the text is read from a
              file titled by the remaining characters in the string.

              Rotate rotates subsequent shape primitives and  text  primitives
              about  the  origin  of  the  main  image.  If the -region option
              precedes the -draw option, the origin for transformations is the
              upper left corner of the region.

              Translate translates them.

              Scale scales them.

              SkewX and SkewY skew them with respect to the origin of the main
              image or the region.

              The transformations modify the current affine matrix,  which  is
              initialized  from  the  initial  affine  matrix  defined  by the
              -affine option.  Transformations are cumulative within the -draw
              option.   The initial affine matrix is not affected; that matrix
              is only changed by the appearance of another -affine option.  If
              another  -draw  option  appears,  the  current  affine matrix is
              reinitialized from the initial affine matrix.

              Use color to change the color of a pixel to the fill color  (see
              -fill). Follow the pixel coordinate with a method:

                   point
                   replace
                   floodfill
                   filltoborder
                   reset

              Consider  the target pixel as that specified by your coordinate.
              The point method recolors the target pixel. The  replace  method
              recolors  any  pixel that matches the color of the target pixel.
              Floodfill recolors any pixel  that  matches  the  color  of  the
              target  pixel  and  is a neighbor, whereas filltoborder recolors
              any neighbor pixel that is not the border color. Finally,  reset
              recolors all pixels.

              Use  matte  to  the change the pixel matte value to transparent.
              Follow the  pixel  coordinate  with  a  method  (see  the  color
              primitive  for  a  description  of  methods).  The  point method
              changes the matte value of the target pixel. The replace  method
              changes  the  matte value of any pixel that matches the color of
              the target pixel. Floodfill changes the matte value of any pixel
              that  matches  the  color of the target pixel and is a neighbor,
              whereas filltoborder changes the matte  value  of  any  neighbor
              pixel  that  is  not  the  border color (-bordercolor).  Finally
              reset changes the matte value of all pixels.

              You can set the primitive color, font,  and  font  bounding  box
              color  with  -fill,  -font,  and  -box respectively. Options are
              processed in command line order so be sure to use these  options
              before the -draw option.

       -edge <radius>
              detect edges within an image

       -emboss <radius>
              emboss an image

       -encoding <type>
              specify the text encoding

              Choose from AdobeCustom, AdobeExpert, AdobeStandard, AppleRoman,
              BIG5, GB2312, Latin 2, None, SJIScode, Symbol, Unicode, Wansung.

       -endian <type>
              specify endianness (MSB, LSB, or Native) of image

              MSB indicates big-endian (e.g. SPARC, Motorola  68K)  while  LSB
              indicates  little-endian  (e.g.  Intel 'x86, VAX) byte ordering.
              Native indicates to use the normal ordering for the current CPU.
              This  option currently only influences the CMYK, DPX, GRAY, RGB,
              and TIFF, formats.

              Use +endian to revert to unspecified endianness.

       -enhance
              apply a digital filter to enhance a noisy image

       -equalize
              perform histogram equalization to the image

       -extent <width>x<height>{+-}<x>{+-}<y>
              composite image on background color canvas image

              This  option  composites  the  image  on  a   background   color
              (-background)  canvas  image.  The  existing  image  content  is
              composited at the position specified by geometry x and y  offset
              and/or  desired  gravity  (-gravity)  using  the  current  image
              compose (-compose) method.  Image content  which  falls  outside
              the bounds of the new image dimensions is discarded.

              For  example,  this command creates a thumbnail of an image, and
              centers it on a red color backdrop image:

                  gm convert  infile.jpg  -thumbnail  120x80  -background  red
              -gravity center -extent 140x100 outfile.jpg

       -file <filename>
              write annotated difference image to file

              If  -file  is  specified,  then an annotated difference image is
              generated and written to the specified file. Pixels which differ
              between the reference and compare images are modified from those
              in the compare image so that  the  changed  pixels  become  more
              obvious.    Some  images  may  require  use  of  an  alternative
              highlight style (see -highlight-style) or highlight  color  (see
              -highlight-color) before the changes are obvious.

       -fill <color>
              color to use when filling a graphic primitive

              Colors  are  represented in GraphicsMagick in the same form used
              by SVG. Use "gm convert -list color" to list named colors:

                  name               (named color)
                  #RGB               (hex numbers, 4 bits each)
                  #RRGGBB            (8 bits each)
                  #RRRGGGBBB         (12 bits each)
                  #RRRRGGGGBBBB      (16 bits each)
                  #RGBA              (4 bits each)
                  #RRGGBBAA          (8 bits each)
                  #RRRGGGBBBAAA      (12 bits each)
                  #RRRRGGGGBBBBAAAA  (16 bits each)
                  rgb(r,g,b)         (r,g,b are decimal numbers)
                  rgba(r,g,b,a)      (r,g,b,a are decimal numbers)

              Enclose the color specification in quotation  marks  to  prevent
              the "#" or the parentheses from being interpreted by your shell.

              For example,

                  gm convert -fill blue ...
                  gm convert -fill "#ddddff" ...
                  gm convert -fill "rgb(65000,65000,65535)" ...

              The  shorter  forms  are scaled up, if necessary by replication.
              For  example,  #3af,  #33aaff,   and   #3333aaaaffff   are   all
              equivalent.

              See -draw for further details.

       -filter <type>
              use this type of filter when resizing an image

              Use  this  option  to  affect the resizing operation of an image
              (see  -geometry).   Choose  from  these  filters   (ordered   by
              approximate increasing CPU time):

                   Point
                   Box
                   Triangle
                   Hermite
                   Hanning
                   Hamming
                   Blackman
                   Gaussian
                   Quadratic
                   Cubic
                   Catrom
                   Mitchell
                   Lanczos
                   Bessel
                   Sinc

              The default filter is automatically selected to provide the best
              quality  while  consuming  a  reasonable  amount  of  time.  The
              Mitchell  filter  is  used  if  the  image  supports  a palette,
              supports a matte channel, or is being  enlarged,  otherwise  the
              Lanczos filter is used.

       -flatten
              flatten a sequence of images

              The  sequence of images is replaced by a single image created by
              composing each image after the first over the first image.

              The sequence of images is terminated by the  appearance  of  any
              option.   If  the -flatten option appears after all of the input
              images, all images are flattened.

       -flip  create a "mirror image"

              reflect the scanlines in the vertical direction.

       -flop  create a "mirror image"

              reflect the scanlines in the horizontal direction.

       -font <name>
              use this font when annotating the image with text

              You can tag a font  to  specify  whether  it  is  a  PostScript,
              TrueType,  or  X11  font.   For example, Arial.ttf is a TrueType
              font, ps:helvetica is PostScript, and x:fixed is X11.

       -foreground <color>
              define the foreground color

              The color is specified using  the  format  described  under  the
              -fill option.

       -format <type>
              the image format type

              When used with the mogrify utility, this option will convert any
              image to the image format you  specify.   See  GraphicsMagick(1)
              for a list of image format types supported by GraphicsMagick, or
              see the output of 'gm -list format'.

              By default the file is written to its original  name.   However,
              if  the  filename  extension  matches  a  supported  format, the
              extension is replaced with the image format type specified  with
              -format.   For  example,  if you specify tiff as the format type
              and the input image filename  is  image.gif,  the  output  image
              filename becomes image.tiff.

       -format <string>
              output formatted image characteristics

              When  used  with  the identify utility, use this option to print
              information about the image in a format of your  choosing.   You
              can  include the image filename, type, width, height, Exif data,
              or  other  image  attributes   by   embedding   special   format
              characters:

                   %b   file size
                   %c   comment
                   %d   directory
                   %e   filename extension
                   %f   filename
                   %h   height
                   %i   input filename
                   %k   number of unique colors
                   %l   label
                   %m   magick
                   %n   number of scenes
                   %o   output filename
                   %p   page number
                   %q   image minimum bit depth
                   %r   image type description
                   %s   scene number
                   %t   top of filename
                   %u   unique temporary filename
                   %w   width
                   %x   x resolution
                   %y   y resolution
                   %#   signature
                   \n   newline
                   \r   carriage return

              For example,

                   -format "%m:%f %wx%h"

              displays  MIFF:bird.miff  512x480  for an image titled bird.miff
              and whose width is 512 and height is 480.

              If the first character of string is @, the format is read from a
              file titled by the remaining characters in the string.

              The values of image type (%p) which may be returned include:

                   Bilevel
                   Grayscale
                   GrayscaleMatte
                   Palette
                   PaletteMatte
                   TrueColor
                   TrueColorMatte
                   ColorSeparation
                   ColorSeparationMatte
                   Optimize

              You  can  also  use  the  following special formatting syntax to
              print Exif information contained in the file:

                   %[EXIF:<tag>]

              Where "<tag>" can be one of the following:

                   *  (print all Exif tags, in keyword=data format)
                   !  (print all Exif tags, in tag_number data format)
                   #hhhh (print data for Exif tag #hhhh)
                   ImageWidth
                   ImageLength
                   BitsPerSample
                   Compression
                   PhotometricInterpretation
                   FillOrder
                   DocumentName
                   ImageDescription
                   Make
                   Model
                   StripOffsets
                   Orientation
                   SamplesPerPixel
                   RowsPerStrip
                   StripByteCounts
                   XResolution
                   YResolution
                   PlanarConfiguration
                   ResolutionUnit
                   TransferFunction
                   Software
                   DateTime
                   Artist
                   WhitePoint
                   PrimaryChromaticities
                   TransferRange
                   JPEGProc
                   JPEGInterchangeFormat
                   JPEGInterchangeFormatLength
                   YCbCrCoefficients
                   YCbCrSubSampling
                   YCbCrPositioning
                   ReferenceBlackWhite
                   CFARepeatPatternDim
                   CFAPattern
                   BatteryLevel
                   Copyright
                   ExposureTime
                   FNumber
                   IPTC/NAA
                   ExifOffset
                   InterColorProfile
                   ExposureProgram
                   SpectralSensitivity
                   GPSInfo
                   ISOSpeedRatings
                   OECF
                   ExifVersion
                   DateTimeOriginal
                   DateTimeDigitized
                   ComponentsConfiguration
                   CompressedBitsPerPixel
                   ShutterSpeedValue
                   ApertureValue
                   BrightnessValue
                   ExposureBiasValue
                   MaxApertureValue
                   SubjectDistance
                   MeteringMode
                   LightSource
                   Flash
                   FocalLength
                   MakerNote
                   UserComment
                   SubSecTime
                   SubSecTimeOriginal
                   SubSecTimeDigitized
                   FlashPixVersion
                   ColorSpace
                   ExifImageWidth
                   ExifImageLength
                   InteroperabilityOffset
                   FlashEnergy
                   SpatialFrequencyResponse
                   FocalPlaneXResolution
                   FocalPlaneYResolution
                   FocalPlaneResolutionUnit
                   SubjectLocation
                   ExposureIndex
                   SensingMethod
                   FileSource
                   SceneType

              Surround  the  format  specification  with  quotation  marks  to
              prevent  your  shell  from misinterpreting any spaces and square
              brackets.

       -frame <width>x<height>+<outer bevel width>+<inner bevel width>
              surround the image with an ornamental border

              See -geometry for details about the geometry specification.  The
              -frame option is not affected by the -gravity option.

              The  color  of  the  border  is  specified  with the -mattecolor
              command line option.

       -frame include the X window frame in the imported image

       -fuzz <distance>{%}
              colors within this Euclidean distance are considered equal

              A number of algorithms search for a target color. By default the
              color  must  be  exact. Use this option to match colors that are
              close (in Euclidean distance) to the  target  color  in  RGB  3D
              space.  For example, if you want to automatically trim the edges
              of an image with -trim but the image was scanned and the  target
              background  color  may differ by a small amount. This option can
              account for these differences.

              The distance can be in absolute intensity units or, by appending
              "%",  as  a  percentage  of the maximum possible intensity (255,
              65535, or 4294967295).

       -gamma <value>
              level of gamma correction

              The same color image displayed on two different workstations may
              look  different  due  to differences in the display monitor. Use
              gamma correction to adjust for this color difference. Reasonable
              values  extend  from 0.8 to 2.3. Gamma less than 1.0 darkens the
              image and gamma greater than 1.0 lightens it. Large  adjustments
              to  image gamma may result in the loss of some image information
              if the pixel quantum size is only eight bits (quantum range 0 to
              255).

              You  can apply separate gamma values to the red, green, and blue
              channels of the image with a gamma  value  list  delimited  with
              slashes (e.g., 1.7/2.3/1.2).

              Use  +gamma  value to set the image gamma level without actually
              adjusting the image pixels. This option is useful if  the  image
              is  of a known gamma but not set as an image attribute (e.g. PNG
              images).

       -gaussian <radius>{x<sigma>}
              blur the image with a Gaussian operator

              Use the given radius and standard deviation (sigma).

       -geometry <width>x<height>{+-}<x>{+-}<y>{%}{@}{!}{^}{<}{>}
              preferred size and location of the Image window.

              By default, the window size is the image size and  the  location
              is chosen by you when it is mapped.

              By  default,  the  width and height are maximum values. That is,
              the image is expanded or contracted to fit the width and  height
              value while maintaining the aspect ratio of the image.

              Append  a  ^  to the geometry so that the image is resized while
              maintaining the aspect ratio of the  image,  but  the  resulting
              width  or  height  are  treated  as  minimum  values rather than
              maximum values.

              Append an exclamation point to the geometry to force  the  image
              size  to  exactly  the  size  you  specify.  For example, if you
              specify 640x480! the image width is set to 640 pixels and height
              to 480.

              If  only the width is specified, the width assumes the value and
              the height is chosen to maintain the aspect ratio of the  image.
              Similarly,  if  only  the  height  is specified (e.g., -geometry
              x256), the width is chosen to maintain the aspect ratio.

              To specify a percentage width or height instead, append  %.  The
              image  size is multiplied by the width and height percentages to
              obtain the final image dimensions. To increase the  size  of  an
              image,  use a value greater than 100 (e.g. 125%). To decrease an
              image's size, use a percentage less than 100.

              Use @ to specify the maximum area in pixels of an image.

              Use > to change the dimensions of the image only if its width or
              height  exceeds  the geometry specification. < resizes the image
              only if both of  its  dimensions  are  less  than  the  geometry
              specification.  For  example,  if you specify '640x480>' and the
              image size is 256x256, the image size does not change.  However,
              if  the image is 512x512 or 1024x1024, it is resized to 480x480.
              Enclose the geometry specification in quotation marks to prevent
              the  <  or  >  from  being  interpreted  by your shell as a file
              redirection.

              When used with animate and display, offsets are handled  in  the
              same  manner as in X(1) and the -gravity option is not used.  If
              the x is negative, the offset  is  measured  leftward  from  the
              right  edge  of  the screen to the right edge of the image being
              displayed.  Similarly, negative y is measured between the bottom
              edges.   The  offsets  are  not affected by "%"; they are always
              measured in pixels.

              When used as a composite option, -geometry gives the  dimensions
              of  the  image  and  its  location with respect to the composite
              image.  If the -gravity option is present with NorthEast,  East,
              or  SouthEast  gravity,  the  x represents the distance from the
              right edge of the image to  the  right  edge  of  the  composite
              image.   Similarly,  if  the  -gravity  option  is  present with
              SouthWest, South, or SouthEast gravity, y  is  measured  between
              the  bottom  edges.  Accordingly,  a  positive offset will never
              point in the direction outside of the image.   The  offsets  are
              not  affected  by  "%";  they are always measured in pixels.  To
              specify the dimensions of the composite image, use  the  -resize
              option.

              When  used  as a convert, import or mogrify option, -geometry is
              synonymous with -resize and specifies the  size  of  the  output
              image.  The offsets, if present, are ignored.

              When  used  as  a  montage option, -geometry specifies the image
              size and border size for  each  tile;  default  is  256x256+0+0.
              Negative  offsets  (border  dimensions)  are  meaningless.   The
              -gravity option affects the placement of the  image  within  the
              tile;  the  default  gravity for this purpose is Center.  If the
              "%" sign appears in the geometry specification, the tile size is
              the specified percentage of the original dimensions of the first
              tile.  To specify the dimensions of the montage, use the -resize
              option.

       -gravity <type>
              direction primitive  gravitates to when annotating the image.

              Choices  are:  NorthWest,  North, NorthEast, West, Center, East,
              SouthWest, South, SouthEast.

              The direction you choose specifies where to  position  the  text
              when annotating the image. For example Center gravity forces the
              text to be centered within the  image.  By  default,  the  image
              gravity  is NorthWest.  See -draw for more details about graphic
              primitives.  Only the text primitive is affected by the -gravity
              option.

              The  -gravity  option is also used in concert with the -geometry
              option and other options that take <geometry>  as  a  parameter,
              such  as the -crop option.  See -geometry for details of how the
              -gravity option interacts with the <x> and <y> parameters  of  a
              geometry specification.

              When  used  as  an  option  to  composite,  -gravity  gives  the
              direction that the image gravitates within the composite.

              When used as an option to montage, -gravity gives the  direction
              that  an image gravitates within a tile.  The default gravity is
              Center for this purpose.

       -green-primary <x>,<y>
              green chromaticity primary point

       -hald-clut <clut>
              apply a Hald CLUT to the image

              A Hald CLUT ("Color Look-Up Table") is a  special  square  color
              image  which  contains a look-up table for red, green, and blue.
              The size of the Hald CLUT image is determined by its order.  The
              width (and height) of a Hald CLUT is the cube of the order.  For
              example, a Hald CLUT of  order  8  is  512x512  pixels  (262,144
              colors)  and  of  order  16 is 4096x4096 (16,777,216 colors).  A
              special CLUT is the identity CLUT which which causes  no  change
              to the input image.  In order to use the Hald CLUT, one takes an
              identity CLUT and adjusts its colors in some way.  The  modified
              CLUT  can  then  be used to transform any number of images in an
              identical way.

              GraphicsMagick contains a built-in identity CLUT  generator  via
              the  IDENTITY  coder.   For  example  reading from the file name
              IDENTITY:8 returns an identity CLUT of order  8.   Typical  Hald
              CLUT  identity  images  have  an order of between 8 and 16.  The
              default  order  for  the   IDENTITY   CLUT   generator   is   8.
              Interpolation  is  used  so it is not usually necessary for CLUT
              images to be very large.  The  PNG  file  format  is  ideal  for
              storing Hald CLUT images because it compresses them very well.

       -help  print usage instructions

       -highlight-color <color>
              pixel annotation color

              Specifies the color to use when annotating difference pixels.

       -highlight-style <style>
              pixel annotation style

              Specifies  the  pixel  difference  annotation style used to draw
              attention to changed pixels. May be one  of  Assign,  Threshold,
              Tint, or XOR; where Assign replaces the pixel with the highlight
              color (see -highlight-color), Threshold replaces the pixel  with
              black  or white based on the difference in intensity, Tint alpha
              tints the pixel with the highlight color, and XOR  does  an  XOR
              between the pixel and the highlight color.

       -iconGeometry <geometry>
              specify the icon geometry

              Offsets,  if  present in the geometry specification, are handled
              in the same manner as the -geometry option, using X11  style  to
              handle negative offsets.

       -iconic
              iconic animation

       -immutable
              make image immutable

       -implode <factor>
              implode image pixels about the center

       -intent <type>
              use this type of rendering intent when managing the image color

              Use  this option to affect the the color management operation of
              an image (see -profile).  Choose from these  intents:  Absolute,
              Perceptual, Relative, Saturation.

              The default intent is undefined.

       -interlace <type>
              the type of interlacing scheme

              Choices  are:  None,  Line,  Plane, or Partition. The default is
              None.

              This option is used to specify the type  of  interlacing  scheme
              for  raw  image  formats  such as RGB or YUV.  None means do not
              interlace (RGBRGBRGBRGBRGBRGB...),

              Line            uses            scanline             interlacing
              (RRR...GGG...BBB...RRR...GGG...BBB...),  and  Plane  uses  plane
              interlacing (RRRRRR...GGGGGG...BBBBBB...).

              Partition is like plane except the different planes are saved to
              individual files (e.g. image.R, image.G, and image.B).

              Use Line to create an interlaced PNG or  GIF or progressive JPEG
              image.

       -label <name>
              assign a label to an image

              Use this option to assign a specific label to  the  image,  when
              writing  to  an image format that supports labels, such as TIFF,
              PNG,  MIFF,  or  PostScript.  You  can  include  the  the  image
              filename,  type,  width,  height,  or  other  image attribute by
              embedding special format character.  A label is not drawn on the
              image, but is embedded in the image datastream via a "Label" tag
              or similar mechanism.  If you want the label to  be  visible  on
              the  image  itself,  use  the  -draw  option.   See -comment for
              details.

              For example,

                   -label "%m:%f %wx%h"

              produces an image label of MIFF:bird.miff 512x480 for  an  image
              titled bird.miff and whose width is 512 and height is 480.

              If  the  first character of string is @, the image label is read
              from a file titled by the remaining characters in the string.

              When converting to PostScript, use  this  option  to  specify  a
              header  string  to print above the image. Specify the label font
              with -font.

              When creating a montage, by default the label associated with an
              image  is  displayed with the corresponding tile in the montage.
              Use the +label option to suppress this behavior.

       -lat <width>x<height>{+-}<offset>{%}
              perform local adaptive thresholding

              Perform local adaptive thresholding using the  specified  width,
              height,  and  offset.   The offset is a distance in sample space
              from the mean, as an absolute integer  ranging  from  0  to  the
              maximum sample value or as a percentage.

       -level <black_point>{,<gamma>}{,<white_point>}{%}
              adjust the level of image contrast

              Give  one,  two  or  three  values delimited with commas: black-
              point, gamma, white-point (e.g. 10,1.0,250 or  2%,0.5,98%).  The
              black and white points range from 0 to MaxRGB or from 0 to 100%;
              if the white point is omitted it is set  to  MaxRGB-black_point.
              If  a  "%" sign is present anywhere in the string, the black and
              white points are percentages of MaxRGB.  Gamma  is  an  exponent
              that  ranges  from  0.1 to 10.; if it is omitted, the default of
              1.0 (no gamma  correction)  is  assumed.  This  interface  works
              similar  to  Photoshop's "Image->Adjustments->Levels..."  "Input
              Levels" interface.

       -limit <type> <value>
              Disk, File, Map, Memory, Pixels, or Threads resource limit

              By default, resource limits are estimated based on the available
              resources  of  the system. The resource limits are Disk, maximum
              total  disk  space  consumed;  File,  maximum  number  of   file
              descriptors  allowed  to  be  open  at  once; Map, maximum total
              number of file bytes which may be memory mapped; Memory, maximum
              total  number  of  bytes  of heap memory used for image storage;
              Pixels, maximum absolute image size (per  image);  and  Threads,
              the  maximum  number  of worker threads to use per OpenMP thread
              team.

              These resource limits are used to decide if (for a given  image)
              the  decoded  image  ("pixel  cache")  should  be stored in heap
              memory (RAM), in a memory-mapped disk file, or in  a  disk  file
              accessed  via read/write I/O.  The number of total pixels in one
              image may also be limited in order  to  force  the  reading,  or
              creation  of  images  larger  than  the  limit  (in  pixels)  to
              intentionally fail. The disk limit establishes an overall  limit
              since  using the disk is the means of last resort. When the disk
              limit has been reached, no more images may be read.

              The value argument is an absolute value, but may  have  standard
              binary  suffix characters applied ('K', 'M', 'G', 'T', 'P', 'E')
              to apply a scaling to the value (based on a multiplier of 1024).
              Any  additional  characters  are  ignored.  For example, '-limit
              Pixels 10MP' limits the maximum image size to 10 megapixels  and
              '-limit  memory  32MB  -limit map 64MB' limits memory and memory
              mapped files to 32 megabytes and 64 megabytes respectively.

              Resource limits may also be set using environment variables. The
              environment   variables  MAGICK_LIMIT_DISK,  MAGICK_LIMIT_FILES,
              MAGICK_LIMIT_MAP, MAGICK_LIMIT_MEMORY, MAGICK_LIMIT_PIXELS,  and
              OMP_NUM_THREADS  may  be  used to set the limits for disk space,
              open files, memory mapped size, heap memory,  per-image  pixels,
              and threads respectively.

              Use the option -list resource list the current limits.

       -linewidth
              the line width for subsequent draw operations

       -list <type>
              the type of list

              Choices  are:  Color, Delegate, Format, Magic, Module, Resource,
              or Type. The Module option is only available  if  GraphicsMagick
              was built to support loadable modules.

              This   option   lists   information   about  the  GraphicsMagick
              configuration.

       -log <string>
              Specify format for debug log

              This option specifies the format for the log  printed  when  the
              -debug option is active.

              You  can  display  the following components by embedding special
              format characters:

                   %d   domain
                   %e   event
                   %f   function
                   %l   line
                   %m   module
                   %p   process ID
                   %r   real CPU time
                   %t   wall clock time
                   %u   user CPU time
                   %%   percent sign
                   \n   newline
                   \r   carriage return

              For example:

                  gm convert -debug coders -log "%u %m:%l %e" in.gif out.png

              The default behavior is to print all of the components.

       -loop <iterations>
              add Netscape loop extension to your GIF animation

              A value other than zero forces the animation to repeat itself up
              to iterations times.

       -magnify
              magnify the image

              The image size is doubled using linear interpolation.

       -magnify <factor>
              magnify the image

              The displayed image is magnified by factor.

       -map <filename>
              choose a particular set of colors from this image

              [convert or mogrify]

              By  default,  color  reduction  chooses an optimal set of colors
              that best represent the original image. Alternatively,  you  can
              choose  a  particular set of colors from an image file with this
              option.

              Use +map to reduce all images in the image sequence that follows
              to  a  single  optimal set of colors that best represent all the
              images.  The sequence of images is terminated by the  appearance
              of  any  option.   If  the  +map option appears after all of the
              input images, all images are mapped.

       -map <type>
              display image using this type.

              [animate or display]

              Choose from these Standard Colormap types:

                   best
                   default
                   gray
                   red
                   green
                   blue

              The X server must support  the  Standard  Colormap  you  choose,
              otherwise  an  error  occurs.  Use  list as the type and display
              searches the list of colormap types in top-to-bottom order until
              one is located. See xstdcmap(1) for one way of creating Standard
              Colormaps.

       -mask <filename>
              Specify a clipping mask

              The image read from the file is used as  a  clipping  mask.   It
              must have the same dimensions as the image being masked.

              If  the  mask  image contains an opacity channel, the opacity of
              each pixel is used to define the mask.  Otherwise, the intensity
              (gray level) of each pixel is used.  Unmasked (black) pixels are
              modified while masked pixels  (not  black)  are  protected  from
              alteration.

              Use +mask to remove the clipping mask.

              It  is not necessary to use -clip to activate the mask; -clip is
              implied by -mask.

       -matte store matte channel if the image has one

              If the image does not have a matte  channel,  create  an  opaque
              one.

              Use  +matte  to  ignore the matte channel and to avoid writing a
              matte channel in the output file.

       -mattecolor <color>
              specify the color to be used with the -frame option

              The color is specified using  the  format  described  under  the
              -fill option.

       -maximum-error <limit>
              specifies the maximum amount of total image error

              Specifies  the  maximum  amount  of  total image error (based on
              comparison using a specified metric)  before  an  error  ("image
              difference  exceeds  limit") is reported.  The error is reported
              via a non-zero command execution return status.

       -median <radius>
              apply a median filter to the image

       -minify <factor>
              minify the image

              The image size is halved using linear interpolation.

       -mode <value>
              mode of operation

              The available montage modes are frame to place the images  in  a
              rectangular   grid   while   adding   a  decorative  frame  with
              dropshadow, unframe to place undecorated images in a rectangular
              grid,  and  concatenate  to  pack  the  images  closely together
              without any well-defined grid or decoration.

       -modulate brightness[,saturation[,hue]]
              vary the brightness, saturation, and hue of an image

              Specify the percent change in brightness, color saturation,  and
              hue  separated  by  commas.  Default  argument  values  are  100
              percent, resulting in no change. For example,  to  increase  the
              color brightness by 20% and decrease the color saturation by 10%
              and leave the hue unchanged, use: -modulate 120,90.

              Hue is the percentage of  absolute  rotation  from  the  current
              position. For example 50 results in a counter-clockwise rotation
              of 90 degrees,  150  results  in  a  clockwise  rotation  of  90
              degrees,  with  0  and  200  both resulting in a rotation of 180
              degrees.

       -monitor
              show progress indication

              A simple command-line progress indication  is  shown  while  the
              command  is  running. The process indication shows the operation
              currently being performed and the  percent  completed.  Commands
              using  X11 may replace the command line progress indication with
              a graphical one once an image has been displayed.

       -monochrome
              transform the image to black and white

       -morph <frames>
              morphs an image sequence

              Both the image pixels and size are linearly interpolated to give
              the appearance of a meta-morphosis from one image to the next.

              The  sequence  of  images is terminated by the appearance of any
              option.  If the -morph option appears after  all  of  the  input
              images, all images are morphed.

       -mosaic
              create a mosaic from an image or an image sequence

              The  -page option can be used to establish the dimensions of the
              mosaic and to locate the images within the mosaic.

              The sequence of images is terminated by the  appearance  of  any
              option.   If  the  -mosaic option appears after all of the input
              images, all images are included in the mosaic.

       -motion-blur <radius>{x<sigma>}{+angle}
              Simulate motion blur

              Simulate motion blur by convolving the  image  with  a  Gaussian
              operator of the given radius and standard deviation (sigma). For
              reasonable results, radius  should  be  larger  than  sigma.  If
              radius is zero, then a suitable radius is automatically selected
              based on sigma. The angle specifies the angle that the object is
              coming from (side which is blurred).

       -name  name an image

       -negate
              replace every pixel with its complementary color

              The  red,  green,  and blue intensities of an image are negated.
              White becomes black, yellow becomes blue, etc.  Use  +negate  to
              only negate the grayscale pixels of the image.

       -noise <radius|type>
              add or reduce noise in an image

              The  principal  function  of noise peak elimination filter is to
              smooth  the  objects  within  an  image  without   losing   edge
              information  and  without  creating  undesired  structures.  The
              central idea of the algorithm is to replace  a  pixel  with  its
              next  neighbor in value within a pixel window, if this pixel has
              been found to be noise. A pixel is defined as noise if and  only
              if this pixel is a maximum or minimum within the pixel window.

              Use radius to specify the width of the neighborhood.

              Use  +noise  followed  by a noise type to add noise to an image.
              Choose from these noise types:

                   Uniform
                   Gaussian
                   Multiplicative
                   Impulse
                   Laplacian
                   Poisson

       -noop  NOOP (no option)

              The -noop option can be used to terminate a group of images  and
              reset  all options to their default values, when no other option
              is desired.

       -normalize
              transform image to span the full range of color values

              This is a contrast enhancement technique.

       -opaque <color>
              change this color to the pen color within the image

              The color is specified using  the  format  described  under  the
              -fill  option.   The color is replaced if it is identical to the
              target color, or close enough to the target color in a 3D  space
              as defined by the Euclidean distance specified by -fuzz.

              See -fill and -fuzz for more details.

       -operator channel operator rvalue[%]
              apply  a  mathematical,  bitwise,  or value operator to an image
              channel

              Apply a low-level mathematical, bitwise, or value operator to  a
              selected  image  channel or all image channels. Operations which
              result in negative results are reset  to  zero,  and  operations
              which  overflow  the  available  range  are reset to the maximum
              possible value.

              Select a channel from: Red, Green, Blue, Opacity,  Matte,  Cyan,
              Magenta,  Yellow,  Black,  All,  or  Gray. All only modifies the
              color channels and does not modify the Opacity  channel.  Except
              for  the  threshold  operators,  All  operates  on  each channel
              independently so that operations are on a per-channel basis.

              Gray treats the color channels  as  a  grayscale  intensity  and
              performs   the  requested  operation  on  the  equivalent  pixel
              intensity so the result is a gray image.

              Select an operator from Add, And, Assign, Depth, Divide,  Gamma,
              Negate,  LShift,  Log,  Max,  Min,  Multiply,  Or,  Pow  RShift,
              Subtract,  Threshold,  Threshold-White,  Threshold-Black,   Xor,
              Noise-Gaussian,     Noise-Impulse,    Noise-Laplacian,    Noise-
              Multiplicative, Noise-Poisson, and Noise-Uniform.

              Rvalue may be any floating  point  or  integer  value.  Normally
              rvalue  will be in the range of 0 to MaxRGB, where MaxRGB is the
              largest quantum value  supported  by  the  GraphicsMagick  build
              (255,  65535,  or  4294967295) but values outside this range are
              useful for some arithmetic operations.  Arguments to logical  or
              bit-wise  operations  are  rounded  to a positive integral value
              prior to use. If  a  percent  (%)  symbol  is  appended  to  the
              argument, then the argument has a range of 0 to 100 percent.

              The following is a description of the operators:

               Add

                    Result is rvalue added to channel value.

               And

                    Result is the logical AND of rvalue with channel value.

               Assign

                    Result is rvalue.

               Depth

                    Result  is  channel  value  adjusted  so  that  it  may be
                    (approximately) stored in the  specified  number  of  bits
                    without additional loss.

               Divide

                    Result is channel value divided by rvalue.

               Gamma

                    Result is channel value gamma adjusted by rvalue.

               LShift

                    Result  is  channel  value  bitwise left shifted by rvalue
                    bits.

               Log

                    Result is computed as log(value*rvalue+1)/log(rvalue+1).

               Max

                    Result is assigned to rvalue if  rvalue  is  greater  than
                    value.

               Min

                    Result is assigned to rvalue if rvalue is less than value.

               Multiply

                    Result is channel value multiplied by rvalue.

               Negate

                    Result is inverse of channel value (like a film negative).
                    An rvalue must be supplied  but  is  currently  not  used.
                    Inverting the image twice results in the original image.

               Or

                    Result is the logical OR of rvalue with channel value.

               Pow

                    Result  is computed as pow(value,rvalue). Similar to Gamma
                    except that rvalue is not inverted.

               RShift

                    Result is channel value bitwise right  shifted  by  rvalue
                    bits.

               Subtract

                    Result is channel value minus rvalue.

               Threshold

                    Result is maximum (white) if channel value is greater than
                    rvalue, or minimum (black) if it is less than or equal  to
                    rvalue.  If  all channels are specified, then thresholding
                    is done based on computed pixel intensity.

               Threshold-white

                    Result is maximum (white) if channel value is greater than
                    rvalue  and  is  unchanged  if it is less than or equal to
                    rvalue. This can be used to remove apparent noise from the
                    bright  parts  of an image. If all channels are specified,
                    then  thresholding  is  done  based  on   computed   pixel
                    intensity.

               Threshold-black

                    Result  is  minimum  (black) if channel value is less than
                    than rvalue and is unchanged if  it  is  greater  than  or
                    equal to rvalue. This can be used to remove apparent noise
                    from the dark parts of  an  image.  If  all  channels  are
                    specified,  then  thresholding  is  done based on computed
                    pixel intensity.

               Xor

                    Result is the logical XOR of rvalue with channel value. An
                    interesting  property  of  XOR is that performing the same
                    operation twice results in the original value.

               Noise-Gaussian

                    Result is the channel value with  gaussian  noise  applied
                    according to the intensity specified by rvalue.

               Noise-Impulse

                    Result  is  the  channel  value with impulse noise applied
                    according to the intensity specified by rvalue.

               Noise-Laplacian

                    Result is the channel value with laplacian  noise  applied
                    according to the intensity specified by rvalue.

               Noise-Multiplicative

                    Result  is  the  channel  value  with multiplicative noise
                    applied according to the intensity specified by rvalue.

               Noise-Poisson

                    Result is the channel value  with  poisson  noise  applied
                    according to the intensity specified by rvalue.

               Noise-Uniform

                    Result  is  the  channel  value with uniform noise applied
                    according to the intensity specified by rvalue.

               As an example, the Assign operator assigns a fixed value  to  a
               channel.  For example, this command sets the red channel to the
               mid-range value:

                 gm convert in.bmp -operator red assign "50%" out.bmp

               The following applies 50% thresholding to the image and returns
               a gray image:

                 gm convert in.bmp -operator gray threshold "50%" out.bmp

       -ordered-dither <channeltype> <NxN>
              ordered dither the image

              The  channel  or  channels specified in the channeltype argument
              are reduced to binary,  using  an  ordered  dither  method.  The
              choices  for  channeltype  are All, Intensity, Red, Green, Blue,
              Cyan, Magenta, Yellow, Black, and Opacity

              When channeltype is "All", the color samples are dithered into a
              gray level and then that gray level is stored in the three color
              channels.  Separately, the opacity channel is  dithered  into  a
              bilevel opacity value which is stored in the opacity channel.

              When  channeltype  is  "Intensity",  only  the color samples are
              dithered. When channeltype is "opacity"  or  "matte",  only  the
              opacity  channel is dithered. When a color channel is specified,
              only that channel is dithered.

              The choices for N are 2, 3, or 4. When N  is  2,  the  image  is
              divided  into  2x2  pixel tiles.  In each tile, 0, 1, 2, 3, or 4
              pixels are turned to white depending on their intensity.  When N
              is  3,  there  are  3x3  tiles  and  10  levels  of  gray can be
              represented.  When N is 4, there are 4x4 tiles and 17 levels  of
              gray.

       -output-directory <directory>
              output files to directory

              Use  -output-directory  to  specify  a  directory under which to
              write the output files. Normally mogrify  overwrites  the  input
              files  but with this option the output files may be written to a
              different directory so that the input files are  preserved.  The
              algorithm  used preserves all of the input path specification in
              the output path so that the user-specified input path (including
              any directory part) is appended to the output path.  The user is
              responsible for creating the output directory.

       -page <width>x<height>{+-}<x>{+-}<y>{%}{!}{<}{>}
              size and location of an image canvas

              Use this option to specify the dimensions of the PostScript page
              in  dots  per  inch  or a TEXT page in pixels. The choices for a
              PostScript page are:

                   11x17         792  1224
                   Ledger       1224   792
                   Legal         612  1008
                   Letter        612   792
                   LetterSmall   612   792
                   ArchE        2592  3456
                   ArchD        1728  2592
                   ArchC        1296  1728
                   ArchB         864  1296
                   ArchA         648   864
                   A0           2380  3368
                   A1           1684  2380
                   A2           1190  1684
                   A3            842  1190
                   A4            595   842
                   A4Small       595   842
                   A5            421   595
                   A6            297   421
                   A7            210   297
                   A8            148   210
                   A9            105   148
                   A10            74   105
                   B0           2836  4008
                   B1           2004  2836
                   B2           1418  2004
                   B3           1002  1418
                   B4            709  1002
                   B5            501   709
                   C0           2600  3677
                   C1           1837  2600
                   C2           1298  1837
                   C3            918  1298
                   C4            649   918
                   C5            459   649
                   C6            323   459
                   Flsa          612   936
                   Flse          612   936
                   HalfLetter    396   612

              For convenience you can specify the page size by media (e.g. A4,
              Ledger,  etc.).  Otherwise,  -page  behaves  much like -geometry
              (e.g.  -page letter+43+43>).

              This option is also used to place subimages when  writing  to  a
              multi-image format that supports offsets, such as GIF89 and MNG.
              When used for this purpose the offsets are always  measured from
              the  top  left  corner of the canvas and are not affected by the
              -gravity  option.   To  position  a  GIF  or  MNG   image,   use
              -page{+-}<x>{+-}<y>  (e.g.  -page  +100+200).  When writing to a
              MNG file, a -page option appearing ahead of the first  image  in
              the sequence with nonzero width and height defines the width and
              height values that are written in the  MHDR  chunk.   Otherwise,
              the MNG width and height are computed from the bounding box that
              contains all images in the sequence.  When writing a GIF89 file,
              only   the   bounding  box  method  is  used  to  determine  its
              dimensions.

              For a PostScript page, the image is sized as  in  -geometry  and
              positioned relative to the lower left hand corner of the page by
              {+-}<xoffset>{+-}<y offset>. Use -page 612x792>, for example, to
              center  the image within the page. If the image size exceeds the
              PostScript page, it is reduced to fit  the  page.   The  default
              gravity  for the -page option is NorthWest, i.e., positive x and
              y offset are measured rightward and downward from the  top  left
              corner of the page, unless the -gravity option is present with a
              value other than NorthWest.

              The default page dimensions for a TEXT image is 612x792.

              This option is used in concert with -density.

              Use +page to remove the page settings for an image.

       -paint <radius>
              simulate an oil painting

              Each pixel is replaced by the most frequent color in a  circular
              neighborhood whose width is specified with radius.

       -pause <seconds>
              pause between animation loops [animate]

              Pause  for  the specified number of seconds before repeating the
              animation.

       -pause <seconds>
              pause between snapshots [import]

              Pause for the specified number of seconds before taking the next
              snapshot.

       -pen <color>
              (This option has been replaced by the -fill option)

       -ping  efficiently determine image characteristics

              Use  this  option  to  disable  reading the image pixels so that
              image characteristics  such  as  the  image  dimensions  may  be
              obtained  very quickly. For identify, use +ping to force reading
              the image pixels so that the pixel read rate may be included  in
              the displayed information.

       -pointsize <value>
              pointsize of the PostScript, X11, or TrueType font

       -preview <type>
              image preview type

              Use  this  option  to  affect  the preview operation of an image
              (e.g.   convert  file.png  -preview  Gamma   Preview:gamma.png).
              Choose from these previews:

                   Rotate
                   Shear
                   Roll
                   Hue
                   Saturation
                   Brightness
                   Gamma
                   Spiff
                   Dull
                   Grayscale
                   Quantize
                   Despeckle
                   ReduceNoise
                   AddNoise
                   Sharpen
                   Blur
                   Threshold
                   EdgeDetect
                   Spread
                   Shade
                   Raise
                   Segment
                   Solarize
                   Swirl
                   Implode
                   Wave
                   OilPaint
                   CharcoalDrawing
                   JPEG

              The default preview is JPEG.

       -process <command>
              process a sequence of images using a process module

              The command argument has the form module=arg1,arg2,arg3,...,argN
              where  module  is  the  name  of  the  module  to  invoke  (e.g.
              "analyze")  and  arg1,arg2,arg3,...,argN are an arbitrary number
              of arguments to pass to the process  module.   The  sequence  of
              images is terminated by the appearance of any option.

              If  the  -process  option appears after all of the input images,
              all images are processed.

       -profile <filename>
              add ICM, IPTC, or generic profile  to image

              -profile filename adds  an  ICM  (ICC  color  management),  IPTC
              (newswire information), or a generic profile to the image

              Use  +profile  icm,  +profile  iptc, or +profile profile_name to
              remove the respective profile.  Multiple profiles may be listed,
              separated  by  commas.  Profiles may be excluded from subsequent
              listed matches by  preceding  their  name  with  an  exclamation
              point.   For  example,  +profile  '!icm,*'  strips  all profiles
              except for the ICM profile.  Use identify -verbose to  find  out
              what profiles are in the image file.  Use +profile "*" to remove
              all profiles.

              To extract a profile, the -profile option is not used.  Instead,
              simply  write  the  file  to an image format such as APP1, 8BIM,
              ICM, or IPTC.

              For example, to extract the Exif data (which is stored  in  JPEG
              files in the APP1 profile), use

                  gm convert cockatoo.jpg exifdata.app1

       +progress
              disable progress monitor and busy cursor

              By  default,  when an image is displayed, a progress monitor bar
              is shown in the top left corner of  an  existing  image  display
              window,  and  the  current  cursor is replaced with an hourglass
              cursor. Use +progress to disable the progress monitor  and  busy
              cursor during display operations.  While the progress monitor is
              disabled for all operations, the busy  cursor  continues  to  be
              enabled  for  non-display  operations  such as image processing.
              This option is useful for non-interactive display operations, or
              when a "clean" look is desired.

       -quality <value>
              JPEG/MIFF/PNG/TIFF compression level
               For the JPEG and MPEG image formats, quality is 0 (lowest image
              quality and highest compression) to 100 (best quality but  least
              effective  compression).  The  default  quality  is 75.  Use the
              -sampling-factor  option  to  specify  the  factors  for  chroma
              downsampling.   To  use  the same quality value as that found by
              the JPEG decoder, use the -define jpeg:preserve-settings flag.

              For the MIFF image format, and the TIFF format while  using  ZIP
              compression,  quality/10 is the zlib compression level, which is
              0 (worst but fastest compression) to 9 (best  but  slowest).  It
              has  no effect on the image appearance, since the compression is
              always lossless.

              For the JPEG-2000 image format, quality is mapped using  a  non-
              linear  equation to the compression ratio required by the Jasper
              library.  This  non-linear  equation  is  intended  to   loosely
              approximate  the  quality  provided  by  the JPEG v1 format. The
              default  quality  value  75  results  in  a  request  for   16:1
              compression. The quality value 100 results in a request for non-
              lossy compression.

              For the MNG and PNG image formats, the quality  value  sets  the
              zlib compression level (quality / 10) and filter-type (quality %
              10). Compression levels range from 0  (fastest  compression)  to
              100  (best  but  slowest). For compression level 0, the Huffman-
              only strategy is used, which is fastest but not necessarily  the
              worst compression.

              If  filter-type  is 4 or less, the specified filter-type is used
              for all scanlines:

                   0: none
                   1: sub
                   2: up
                   3: average
                   4: Paeth

              If filter-type is 5, adaptive filtering is used when quality  is
              greater  than  50  and  the  image  does  not  have a color map,
              otherwise no filtering is used.

              If filter-type is 6,  adaptive  filtering  with  minimum-sum-of-
              absolute-values is used.

              Only  if  the output is MNG, if filter-type is 7, the LOCO color
              transformation  and  adaptive  filtering  with   minimum-sum-of-
              absolute-values are used.

              The  default  is  quality  is  75,  which  means nearly the best
              compression with adaptive filtering.  The quality setting has no
              effect  on  the  appearance  of  PNG  and  MNG images, since the
              compression is always lossless.

              For further information, see the PNG specification.

              When writing a JNG image with transparency, two  quality  values
              are  required,  one for the main image and one for the grayscale
              image that conveys the opacity channel.  These are written as  a
              single  integer  equal to the main image quality plus 1000 times
              the opacity quality.  For example, if you want to use quality 75
              for  the main image and quality 90 to compress the opacity data,
              use -quality 90075.

              For the PNM family of formats (PNM,  PGM,  and  PPM)  specify  a
              quality  factor  of zero in order to obtain the ASCII variant of
              the format. Note that -compress none used to be used to  trigger
              ASCII  output  but  provided  the  opposite  result  of what was
              expected as compared with other formats.

       -raise <width>x<height>
              lighten or darken image edges

              This will create a 3-D effect. See -geometry for details details
              about the geometry specification. Offsets are not used.

              Use -raise to create a raised effect, otherwise use +raise.

       -random-threshold <channeltype> <LOWxHIGH>
              random threshold the image

              The  channel or channels specified in the <channeltype> argument
              are reduced to binary, using  an  random-threshold  method.  The
              choices  for  channeltype  are All, Intensity, Red, Green, Blue,
              Cyan, Magenta, Yellow, Black, and Opacity

              When channeltype is "All", the  color  samples  are  thresholded
              into a graylevel and then that gray level is stored in the three
              color channels. Separately, the opacity channel  is  thresholded
              into  a  bilevel  opacity  value  which is stored in the opacity
              channel. For  each  pixel,  a  new  random  number  is  used  to
              establish  the threshold to be used. The threshold never exceeds
              the  specified  maximum  (HIGH)  and  is  never  less  than  the
              specified minimum (LOW).

              When  channeltype  is  "intensity",  only  the color samples are
              thresholded. When channeltype is "opacity" or "matte", only  the
              opacity  channel  is  thresholded. The other named channels only
              threshold the associated channel.

       -recolor <matrix>
              apply a color translation matrix to image channels

              A user supplied color translation matrix (expressed  as  a  text
              string)  is  used to translate/blend the image channels based on
              weightings in a supplied matrix which may be of order  3  (color
              channels  only),  4  (color  channels plus opacity), or 5 (color
              channels plus opacity and offset).  Values in the columns of the
              matrix  (red, green, blue, opacity) are used as multipliers with
              the existing channel values and added together according to  the
              rows of the matrix.  Matrix values are floating point and may be
              negative.  The offset column (column 5) is purely  additive  and
              is  scaled  such  that 0.0 to 1.0 represents the maximum quantum
              range (but values are not limited to this range). The  math  for
              the  color  translation  matrix is similar to that used by Adobe
              Flash except that the offset is  scaled  to  1.0  (divide  Flash
              offset  by  255 for use with GraphicsMagick) so that the results
              are independent of quantum depth.

              An identity matrix exists for each matrix order which results in
              no  change to the image.  The translation matrix should be based
              on an alteration of the identity matrix.

              Identity matrix of order 3

                1 0 0
                0 1 0
                0 0 1

              which may be formatted into a convenient matrix argument similar
              to (comma is treated as white space):

                -recolor "1 0 0, 0 1 0, 0 0 1"

              Identity matrix of order 4

                1 0 0 0
                0 1 0 0
                0 0 1 0
                0 0 0 1

              Identity  matrix  of order 5.  The last row is required to exist
              for the purpose of parsing, but is otherwise not used.

                1 0 0 0 0
                0 1 0 0 0
                0 0 1 0 0
                0 0 0 1 0
                0 0 0 0 1

              As an example, an image wrongly in  BGR  channel  order  may  be
              converted to RGB using this matrix (green->red, red->green):

                0 0 1
                0 1 0
                1 0 0

              and  an  RGB  image  using  standard  Rec.709  primaries  may be
              converted to grayscale using this matrix of  standard  weighting
              factors:

                0.2126 0.7152 0.0722
                0.2126 0.7152 0.0722
                0.2126 0.7152 0.0722

              and  contrast may be reduced by scaling down by 80% and adding a
              10% offset:

                0.8 0.0 0.0 0.0 0.1
                0.0 0.8 0.0 0.0 0.1
                0.0 0.0 0.8 0.0 0.1
                0.0 0.0 0.0 0.8 0.1
                0.0 0.0 0.0 0.0 1.0

       -red-primary <x>,<y>
              red chromaticity primary point

       -region <width>x<height>{+-}<x>{+-}<y>
              apply options to a portion of the image

              The x and y offsets are treated in the same manner as in -crop.

       -remote
              perform a X11 remote operation

              The -remote command sends a command to a  "gm  display"  or  "gm
              animate"  which  is already running. The only command recognized
              at this time is  the  name  of  an  image  file  to  load.  This
              capability  is very useful to load new images without needing to
              restart  GraphicsMagick  (e.g.  for  a  slide-show  or  to   use
              GraphicsMagick  as the display engine for a different GUI). Also
              see  the  +progress  option  for  a  way  to  disable   progress
              indication for a clean look while loading new images.

       -render
              render vector operations

              Use  +render  to  turn  off rendering vector operations. This is
              useful when saving the result to vector formats such as  MVG  or
              SVG.

       -resample <horizontal>x<vertical>
              Resample image to specified horizontal and vertical resolution

              Resize  the  image so that its rendered size remains the same as
              the original at the  specified  target  resolution.  Either  the
              current image resolution units or the previously set with -units
              are used to interpret the argument. For example, if  a  300  DPI
              image  renders at 3 inches by 2 inches on a 300 DPI device, when
              the image has been resampled to 72 DPI,  it  will  render  at  3
              inches  by  2 inches on a 72 DPI device.  Note that only a small
              number of image formats (e.g. JPEG, PNG, and TIFF)  are  capable
              of  storing  the  image  resolution.  For  formats  which do not
              support an image resolution,  the  original  resolution  of  the
              image  must  be specified via -density on the command line prior
              to specifying the resample resolution.

              Note that Photoshop stores and obtains image resolution  from  a
              proprietary  embedded  profile.  If  this  profile exists in the
              image, then Photoshop will continue to treat the image using its
              former  resolution,  ignoring  the image resolution specified in
              the standard file header.

              Some image formats (e.g. PNG) require use of metric  or  english
              units  so  even  if  the  original  image used a particular unit
              system,  if  it  is  saved  to  a  different  format  prior   to
              resampling,  then  it  may  be  necessary to specify the desired
              resolution units using -units since the original units may  have
              been  lost.  In  other  words, do not assume that the resolution
              units are restored if the image has been saved to a file.

       -resize <width>x<height>{%}{@}{!}{<}{>}
              resize an image

              This is an alias for the -geometry option and it behaves in  the
              same  manner. If the -filter option precedes the -resize option,
              the specified filter is used.

              There are some exceptions:

              When used as a composite option, -resize conveys  the  preferred
              size  of  the output image, while -geometry conveys the size and
              placement of the composite image within the main image.

              When used as a montage option,  -resize  conveys  the  preferred
              size  of  the montage, while -geometry conveys information about
              the tiles.

       -roll {+-}<x>{+-}<y>
              roll an image vertically or horizontally

              See -geometry for details the geometry specification.  The x and
              y offsets are not affected by the -gravity option.

              A  negative x offset rolls the image left-to-right. A negative y
              offset rolls the image top-to-bottom.

       -rotate <degrees>{<}{>}
              rotate the image

              Positive angles rotate the image in a clockwise direction  while
              negative angles rotate counter-clockwise.

              Use  > to rotate the image only if its width exceeds the height.
              < rotates the image only if its width is less than  the  height.
              For example, if you specify -rotate "-90>" and the image size is
              480x640, the image is not rotated.  However,  if  the  image  is
              640x480,  it  is  rotated  by  -90  degrees.  If you use > or <,
              enclose  it  in  quotation  marks  to  prevent  it  from   being
              misinterpreted as a file redirection.

              Empty  triangles  left  over  from rotating the image are filled
              with the color defined as  background  (class  backgroundColor).
              The  color  is  specified  using  the format described under the
              -fill option.

       -sample <geometry>
              scale image using pixel sampling

              See -geometry for  details  about  the  geometry  specification.
              -sample  ignores  the -filter selection if the -filter option is
              present.  Offsets,  if  present  in  the  geometry  string,  are
              ignored, and the -gravity option has no effect.

       -sampling-factor <horizontal_factor>x<vertical_factor>
              chroma subsampling factors

              This  option  specifies  the  sampling factors to be used by the
              DPX, JPEG, MPEG, or YUV encoders for  chroma  downsampling.  The
              sampling  factor  must  be  specified  while reading the raw YUV
              format since it is not preserved in the file header.   Industry-
              standard  video subsampling notation such as "4:2:2" may also be
              used to specify the sampling factors. "4:2:2" is equivalent to a
              specification of "2x1"

              The  JPEG  decoder  obtains  the  original sampling factors (and
              quality settings) when a  JPEG  file  is  read.  To  re-use  the
              original  sampling  factors  (and  quality setting) when JPEG is
              output, use the -define jpeg:preserve-settings flag.

       -scale <geometry>
              scale the image.

              See -geometry for  details  about  the  geometry  specification.
              -scale  uses  a  simpler,  faster  algorithm, and it ignores the
              -filter selection if the -filter option is present.  Offsets, if
              present  in  the  geometry string, are ignored, and the -gravity
              option has no effect.

       -scene <value>
              set scene number

              This option sets the scene number of an image or the first image
              in an image sequence.

       -scenes <value-value>
              range of image scene numbers to read

              Each  image in the range is read with the filename followed by a
              period (.) and the decimal scene number.  You  can  change  this
              behavior  by  embedding a %d, %0Nd, %o, %0No, %x, or %0Nx printf
              format specification in the file name. For example,

                  gm montage -scenes 5-7 image.miff

              makes  a  montage  of  files  image.miff.5,  image.miff.6,   and
              image.miff.7, and

                  gm animate -scenes 0-12 image%02d.miff

              animates files image00.miff, image01.miff, through image12.miff.

       -screen
              specify the screen to capture

              This  option  indicates that the GetImage request used to obtain
              the image should  be  done  on  the  root  window,  rather  than
              directly  on  the specified window.  In this way, you can obtain
              pieces of other windows that overlap the specified  window,  and
              more importantly, you can capture menus or other popups that are
              independent windows but appear over the specified window.

       -set <attribute> <value>
              set an image attribut

              Set a named image  attribute.   The  attribute  is  set  on  the
              current (previously specified on command line) image.

       -segment <cluster threshold>x<smoothing threshold>
              segment an image

              Segment  an  image  by  analyzing  the  histograms  of the color
              components and identifying units that are homogeneous  with  the
              fuzzy c-means technique.

              Segmentation  is  a  very  useful fast and and approximate color
              quantization algorithm for  scanned  printed  pages  or  scanned
              cartoons.  It  may  also  be  used  as a special effect. Specify
              cluster threshold as the minimum percentage of total pixels in a
              cluster   before  it  is  considered  valid.   For  huge  images
              containing small detail, this may need to be a tiny fraction  of
              a  percent  (e.g.  0.015)  so that important detail is not lost.
              Smoothing threshold eliminates noise in the second derivative of
              the  histogram.  As  the  value  is  increased, you can expect a
              smoother second derivative. The default is 1.5. Add the -verbose
              option  to see a dump of cluster statistics given the parameters
              used. The statistics may be used as a guide to  help  fine  tune
              the options.

       -shade <azimuth>x<elevation>
              shade the image using a distant light source

              Specify  azimuth  and  elevation  as  the  position of the light
              source. Use +shade to return the shading results as a  grayscale
              image.

       -shadow <radius>{x<sigma>}
              shadow the montage

       -shared-memory
              use shared memory

              This  option specifies whether the utility should attempt to use
              shared memory for pixmaps.  GraphicsMagick must be compiled with
              shared  memory support, and the display must support the MIT-SHM
              extension.  Otherwise, this option is ignored.  The  default  is
              True.

       -sharpen <radius>{x<sigma>}
              sharpen the image

              Use  a  Gaussian  operator  of  the  given  radius  and standard
              deviation (sigma).

       -shave <width>x<height>{%}
              shave pixels from the image edges

              Specify the width of the region to be removed from both sides of
              the  image  and the height of the regions to be removed from top
              and bottom.

       -shear <x degrees>x<y degrees>
              shear the image along the X or Y axis

              Use the specified positive or negative shear angle.

              Shearing slides one edge of an image along  the  X  or  Y  axis,
              creating  a  parallelogram.  An X direction shear slides an edge
              along the X axis, while a Y direction shear slides an edge along
              the  Y  axis.  The  amount of the shear is controlled by a shear
              angle. For X direction shears, x degrees is measured relative to
              the  Y  axis, and similarly, for Y direction shears y degrees is
              measured relative to the X axis.

              Empty triangles left over from shearing  the  image  are  filled
              with  the  color  defined as background (class backgroundColor).
              The color is specified using  the  format  described  under  the
              -fill option.

       -silent
              operate silently

       -size <width>x<height>{+offset}
              width and height of the image

              Use  this  option  to specify the width and height of raw images
              whose dimensions are unknown such as  GRAY,  RGB,  or  CMYK.  In
              addition  to  width and height, use -size with an offset to skip
              any header information in the image or tell the number of colors
              in a MAP image file, (e.g. -size 640x512+256).

              For Photo CD images, choose from these sizes:

                   192x128
                   384x256
                   768x512
                   1536x1024
                   3072x2048

              Finally, use this option to choose a particular resolution layer
              of a JBIG or JPEG image (e.g. -size 1024x768).

       -snaps <value>
              number of screen snapshots

              Use this option to grab more than one image from  the  X  server
              screen, to create an animation sequence.

       -solarize <factor>
              negate all pixels above the threshold level

              Specify  factor  as  the percent threshold of the intensity (0 -
              99.9%).

              This option produces a solarization effect seen when exposing  a
              photographic film to light during the development process.

       -spread <amount>
              displace image pixels by a random amount

              Amount defines the size of the neighborhood around each pixel to
              choose a candidate pixel to swap.

       -stegano <offset>
              hide watermark within an image

              Use an offset to start the image hiding some  number  of  pixels
              from the beginning of the image.  Note this offset and the image
              size.   You  will  need  this   information   to   recover   the
              steganographic    image    (e.g.    display   -size   320x256+35
              stegano:image.png).

       -stereo
              composite two images to create a stereo anaglyph

              The left side of the stereo pair is saved as the red channel  of
              the output image.  The right side is saved as the green channel.
              Red-green stereo glasses  are  required  to  properly  view  the
              stereo image.

       -stroke <color>
              color to use when stroking a graphic primitive

              The  color  is  specified  using  the format described under the
              -fill option.

              See -draw for further details.

       -strokewidth <value>
              set the stroke width

              See -draw for further details.

       -swirl <degrees>
              swirl image pixels about the center

              Degrees defines the tightness of the swirl.

       -text-font <name>
              font for writing fixed-width text

              Specifies the name  of  the  preferred  font  to  use  in  fixed
              (typewriter  style)  formatted  text.   The  default is 14 point
              Courier.

              You can tag a font  to  specify  whether  it  is  a  PostScript,
              TrueType,  or  X11 font.  For example, Courier.ttf is a TrueType
              font and x:fixed is X11.

       -texture <filename>
              name of texture to tile onto the image background

       -threshold <value>{%}
              threshold the image

              Modify the image such that any pixel sample  with  an  intensity
              value  greater  than  the  threshold  is  assigned  the  maximum
              intensity  (white),  or  otherwise  is  assigned   the   minimum
              intensity  (black).  If  a  percent  prefix is applied, then the
              threshold is a percentage of the available range.

              To efficiently create a black  and  white  image  from  a  color
              image, use

                  gm convert -threshold 50% in.png out.png

              The  optimum threshold value depends on the nature of the image.
              In order to threshold individual  channels,  use  the  -operator
              subcommand  with  it's Threshold, Threshold-White, or Threshold-
              Black options.

       -thumbnail <width>x<height>{%}{@}{!}{<}{>}
              resize an image (quickly)

              The -thumbnail command resizes the image as quickly as possible,
              with  more  concern  for  speed  than  resulting  image quality.
              Regardless, resulting image quality  should  be  acceptable  for
              many  uses.   It  is  primarily  intended to be used to generate
              smaller versions of the image, but may also be used  to  enlarge
              the  image.   The -thumbnail geometry argument observes the same
              syntax and rules as it does for -resize.

       -tile <filename>
              tile image when filling a graphic primitive

       -tile <geometry>
              layout of images [montage]

       -title <string>
              assign title to displayed image [animate, display, montage]

              Use this option to assign a specific title to the image. This is
              assigned  to  the image window and is typically displayed in the
              window  title  bar.   Optionally  you  can  include  the   image
              filename,  type,  width,  height,  Exif  data,  or  other  image
              attribute by embedding special format characters described under
              the -format option.

              For example,

                   -title "%m:%f %wx%h"

              produces  an  image title of MIFF:bird.miff 512x480 for an image
              titled bird.miff and whose width is 512 and height is 480.

       -transform
              transform the image

              This option applies the transformation matrix  from  a  previous
              -affine option.

                  gm convert -affine 2,2,-2,2,0,0 -transform bird.ppm bird.jpg

       -transparent <color>
              make this color transparent within the image

              The  color  is  specified  using  the format described under the
              -fill option.

       -treedepth <value>
              tree depth for the color reduction algorithm

              Normally, this integer value is zero or one. A value of zero  or
              one  causes  the  use  of  an  optimal  tree depth for the color
              reduction algorithm

              An optimal depth generally allows the best representation of the
              source  image with the fastest computational speed and the least
              amount of memory.  However, the default depth  is  inappropriate
              for  some  images. To assure the best representation, try values
              between 2 and 8 for this parameter.  Refer to quantize for  more
              details.

              The -colors or -monochrome option, or writing to an image format
              which requires color reduction, is required for this  option  to
              take effect.

       -trim  trim an image

              This option removes any edges that are exactly the same color as
              the corner pixels.  Use -fuzz to make -trim  remove  edges  that
              are nearly the same color as the corner pixels.

       -type <type>
              the image type

              Choose   from:   Bilevel,   Grayscale,   Palette,  PaletteMatte,
              TrueColor,           TrueColorMatte,            ColorSeparation,
              ColorSeparationMatte, or Optimize.

              Normally,  when  a  format supports different subformats such as
              bilevel, grayscale, palette, truecolor, and truecolor+alpha, the
              encoder  will  try  to  choose a suitable subformat based on the
              nature of the image. The -type option may be used to tailor  the
              output  subformat.  By  default the output subformat is based on
              readily available image information and is  usually  similar  to
              the input format.

              Specify  -type Optimize in order to enable inspecting all pixels
              (if necessary) in order to find the  most  efficient  subformat.
              Inspecting  all of the pixels may be slow for very large images,
              particularly if they are stored in a disk cache. If an RGB image
              contains only gray pixels, then every pixel in the image must be
              inspected  in  order  to  decide  that  the  image  is  actually
              grayscale!

              Sometimes a specific subformat is desired. For example, to force
              a JPEG image to be written in TrueColor RGB format  even  though
              only gray pixels are present, use

                  gm convert bird.pgm -type TrueColor bird.jpg

              Similarly,  using -type TrueColorMatte will force the encoder to
              write an alpha channel even though the image is opaque,  if  the
              output format supports transparency.

              Some  pseudo-formats  (e.g.  the  XC  format)  will  respect the
              requested type if it occurs previously on the command line.  For
              example, to obtain a DirectClass solid color canvas image rather
              than PsuedoClass, use

                  gm convert -size 640x480 -type TrueColor xc:red red.miff

              Likewise,  specify  -type  Bilevel,  Grayscale,  TrueColor,   or
              TrueColorMatte  prior  to  reading a Postscript (or PDF file) in
              order to influence the type of image  that  Ghostcript  returns.
              Reading   performance   will   be   dramatically   improved  for
              black/white Postscript if Bilevel  is  specified,  and  will  be
              considerably faster if Grayscale is specified.

       -update <seconds>
               detect when image file is modified and redisplay.

              Suppose  that while you are displaying an image the file that is
              currently displayed is over-written.  display will automatically
              detect  that  the  input  file  has  been changed and update the
              displayed image accordingly.

       -units <type>
              the units of image resolution

              Choose from: Undefined, PixelsPerInch,  or  PixelsPerCentimeter.
              This  option  is  normally used in conjunction with the -density
              option.

       -unsharp <radius>{x<sigma>}{+<amount>}{+<threshold>}
              sharpen the image with an unsharp mask operator

              The -unsharp option sharpens an image. The  image  is  convolved
              with  a  Gaussian  operator  of  the  given  radius and standard
              deviation (sigma). For  reasonable  results,  radius  should  be
              larger than sigma. Use a radius of 0 to have the method select a
              suitable radius.

              The parameters are:

               radius

                    The radius of the Gaussian, in pixels,  not  counting  the
                    center pixel (default 0).

               sigma

                    The standard deviation of the Gaussian, in pixels (default
                    1.0).

               amount

                    The percentage of the difference between the original  and
                    the  blur  image  that  is  added  back  into the original
                    (default 1.0).

               threshold

                    The threshold, as a fraction of MaxRGB,  needed  to  apply
                    the difference amount (default 0.05).

       -use-pixmap
              use the pixmap

       -verbose
              print detailed information about the image

              This  information  is  printed:  image scene number; image name;
              image size; the image class (DirectClass  or  PseudoClass);  the
              total number of unique colors; and the number of seconds to read
              and transform the image. If the image is DirectClass, the  total
              number  of  unique  colors  is  not displayed unless -verbose is
              specified twice since it may take quite a long time to  compute,
              particularly  for deep images.  If the image is PseudoClass then
              its pixels are defined by indexes into a colormap. If the  image
              is   DirectClass   then  each  pixel  includes  a  complete  and
              independent color specification.

              If -colors is also specified, the total  unique  colors  in  the
              image  and  color  reduction  error values are printed. Refer to
              quantize for a description of these values.

       -version
              print GraphicsMagick version string

       -view <string>
              FlashPix viewing parameters

       -virtual-pixel <method>
              specify contents of "virtual pixels"

              This option defines "virtual pixels" for use in operations  that
              can access pixels outside the boundaries of an image.

              Choose from these methods:

               Constant

                    Use the image background color.

               Edge

                    Extend the edge pixel toward infinity (default).

               Mirror

                    Mirror the image.

               Tile

                    Tile the image.

               This  option affects operations that use virtual pixels such as
               -blur, -sharpen, -wave, etc.

       -visual <type>
              animate images using this X visual type

              Choose from these visual classes:

                   StaticGray
                   GrayScale
                   StaticColor
                   PseudoColor
                   TrueColor
                   DirectColor
                   default
                   visual id

              The X server must support the visual you  choose,  otherwise  an
              error  occurs.   If  a visual is not specified, the visual class
              that can display the most simultaneous  colors  on  the  default
              screen is chosen.

       -watermark <brightness>x<saturation>
              percent brightness and saturation of a watermark

       -wave <amplitude>x<wavelength>
              alter an image along a sine wave

              Specify amplitude and wavelength of the wave.

       -white-point <x>,<y>
              chromaticity white point

       -white-threshold red[,green][,blue][,opacity]
              pixels above the threshold become white

              Use  -white-threshold  to  set  pixels  with  values  above  the
              specified threshold to maximum value (white). If only one  value
              is  supplied,  or the red, green, and blue values are identical,
              then intensity thresholding is  used.  If  the  color  threshold
              values  are  not  identical  then  channel-based thresholding is
              used, and color distortion will occur. Specify a negative  value
              (e.g. -1) if you want a channel to be ignored but you do want to
              threshold a channel later in the list. If a percent  (%)  symbol
              is  appended,  then  the  values  are treated as a percentage of
              maximum range.

       -window <id>
              make image the background of a window

              id can be a window id or name.  Specify root to select X's  root
              window as the target window.

              By  default the image is tiled onto the background of the target
              window.   If backdrop or -geometry are specified, the  image  is
              surrounded  by  the  background color.  Refer to X RESOURCES for
              details.

              The image will not display on the root window if the  image  has
              more  unique colors than the target window colormap allows.  Use
              -colors to reduce the number of colors.

       -window-group
              specify the window group

       -write <filename>
              write an intermediate image [convert, composite]

              The current image is written to the specified filename and  then
              processing  continues  using  that  image.  The  following is an
              example of how several sizes of an image may be generated in one
              command (repeat as often as needed):

                  gm convert input.jpg -resize 50% -write input50.jpg
                    -resize 25% input25.jpg

       -write <filename>
              write the image to a file [display]

              If  filename  already exists, you will be prompted as to whether
              it should be overwritten.

              By default, the image is written in the format that it was  read
              in  as.   To  specify a particular image format, prefix filename
              with the image type and a colon (e.g., ps:image) or specify  the
              image type as the filename suffix (e.g., image.ps). Specify file
              as - for standard output. If file has the extension .Z  or  .gz,
              the file size is compressed using compress or gzip respectively.
              Precede the image file name with | to pipe to a system command.

              Use -compress to specify the type of image compression.

              The equivalent X  resource  for  this  option  is  writeFilename
              (class WriteFilename).  See "X Resources", below, for details.

GM ANIMATE

SYNOPSIS

       animate [ options ...] file [ [ options ...] file ...]

DESCRIPTION

       </im>

       Animate  displays  a  sequence  of  images  on  any workstation display
       running an X server. animate first determines the hardware capabilities
       of  the workstation. If the number of unique colors in an image is less
       than or equal to the number the workstation can support, the  image  is
       displayed  in  an X window. Otherwise the number of colors in the image
       is first reduced to match  the  color  resolution  of  the  workstation
       before it is displayed.

       This  means  that a continuous-tone 24 bits-per-pixel image can display
       on a 8 bit pseudo-color device or monochrome device. In most  instances
       the  reduced color image closely resembles the original. Alternatively,
       a  monochrome  or  pseudo-color  image  sequence  can  display   on   a
       continuous-tone 24 bits-per-pixel device.

       To help prevent color flashing on X server visuals that have colormaps,
       animate creates a single colormap from the image sequence. This can  be
       rather  time consuming. You can speed this operation up by reducing the
       colors in the image before you "animate" them.  Use  mogrify  to  color
       reduce  the  images  to  a single colormap. See mogrify(1) for details.
       Alternatively, you can use a Standard Colormap; or a static, direct, or
       true  color  visual.  You can define a Standard Colormap with xstdcmap.
       See xstdcmap(1) for details. This method is recommended for colormapped
       X server because it eliminates the need to compute a global colormap.

EXAMPLES

       To animate a set of images of a cockatoo, use:

           gm animate cockatoo.*

       To  animate a cockatoo image sequence while using the Standard Colormap
       best, use:

           xstdcmap -best
           gm animate -map best cockatoo.*

       To animate an image of a  cockatoo  without  a  border  centered  on  a
       backdrop, use:

           gm animate +borderwidth -backdrop cockatoo.*

OPTIONS

       For a more detailed description of each option, see Options, above.

       -authenticate <string>
              decrypt image with this password

       -backdrop
              display the image centered on a backdrop.

       -background <color>
              the background color

       -bordercolor <color>
              the border color

       -borderwidth <geometry>
              the border width

       -chop <width>x<height>{+-}<x>{+-}<y>{%}
              remove pixels from the interior of an image

       -colormap <type>
              define the colormap type

       -colors <value>
              preferred number of colors in the image

       -colorspace <value>
              the type of colorspace

       -crop <width>x<height>{+-}<x>{+-}<y>{%}
              preferred size and location of the cropped image

       -debug <events>
              enable debug printout

       -define <key>{=<value>},...
              add coder/decoder specific options

       -delay <1/100ths of a second>
              display the next image after pausing

       -density <width>x<height>
              horizontal and vertical resolution in pixels of the image

       -depth <value>
              depth of the image

       -display <host:display[.screen]>
              specifies the X server to contact

       -dispose <method>
              GIF disposal method

       -dither
              apply Floyd/Steinberg error diffusion to the image

       -font <name>
              use this font when annotating the image with text

       -foreground <color>
              define the foreground color

       -gamma <value>
              level of gamma correction

       -geometry <width>x<height>{+-}<x>{+-}<y>{%}{@}{!}{^}{<}{>}
              preferred size and location of the Image window.

       -help  print usage instructions

       -iconGeometry <geometry>
              specify the icon geometry

       -iconic
              iconic animation

       -interlace <type>
              the type of interlacing scheme

       -limit <type> <value>
              Disk, File, Map, Memory, Pixels, or Threads resource limit

       -log <string>
              Specify format for debug log

       -map <type>
              display image using this type.

       -matte store matte channel if the image has one

       -mattecolor <color>
              specify the color to be used with the -frame option

       -monitor
              show progress indication

       -monochrome
              transform the image to black and white

       -name  name an image

       -noop  NOOP (no option)

       -pause <seconds>
              pause between animation loops [animate]

       -remote
              perform a X11 remote operation

       -rotate <degrees>{<}{>}
              rotate the image

       -sampling-factor <horizontal_factor>x<vertical_factor>
              chroma subsampling factors

       -scenes <value-value>
              range of image scene numbers to read

       -shared-memory
              use shared memory

       -size <width>x<height>{+offset}
              width and height of the image

       -text-font <name>
              font for writing fixed-width text

       -title <string>
              assign title to displayed image [animate, display, montage]

       -treedepth <value>
              tree depth for the color reduction algorithm

       -trim  trim an image

       -type <type>
              the image type

       -verbose
              print detailed information about the image

       -version
              print GraphicsMagick version string

       -visual <type>
              animate images using this X visual type

       -window <id>
              make image the background of a window

              For  a  more  detailed  description of each option, see Options,
              above.

              Any option you specify on the command line remains in effect for
              the  group of images following it, until the group is terminated
              by the appearance of any  option  or  -noop.   For  example,  to
              animate  three images, the first with 32 colors, the second with
              an unlimited number of  colors,  and  the  third  with  only  16
              colors, use:

                   gm animate -colors 32 cockatoo.1 -noop cockatoo.2
                           -colors 16 cockatoo.3

              Animate  options  can  appear  on  the command line or in your X
              resources file. See X(1). Options on the command line  supersede
              values  specified in your X resources file.  Image filenames may
              appear in any order on the command line if the image  format  is
              MIFF (refer to miff(5) and the scene keyword is specified in the
              image. Otherwise the images  will  display  in  the  order  they
              appear on the command line.

MOUSE BUTTONS

       Press  any  button  to  map  or  unmap the Command widget. See the next
       section for more information about the Command widget.

COMMAND WIDGET

       The Command widget lists a number of sub-menus and commands. They are

           Animate

               Open
               Play
               Step
               Repeat
               Auto Reverse

           Speed

               Faster
               Slower

           Direction

               Forward
               Reverse

           Image Info
           Help
           Quit

       Menu  items  with  a  indented  triangle  have  a  sub-menu.  They  are
       represented  above  as  the  indented items. To access a sub-menu item,
       move the pointer to the appropriate menu and press a button  and  drag.
       When  you  find  the  desired sub-menu item, release the button and the
       command is executed.  Move the pointer away from the  sub-menu  if  you
       decide not to execute a particular command.

KEYBOARD ACCELERATORS

               Ctl+O

                    Press to load an image from a file.
               space

                    Press to display the next image in the sequence.
               <

                    Press  to  speed-up  the  display of the images.  Refer to
                    -delay for more information.
               >

                    Press to slow the display of the images.  Refer to  -delay
                    for more information.
               ?

                    Press  to  display information about the image.  Press any
                    key or button to erase the information.
                    This information is printed: image name;  image size;  and
                    the total number of unique colors in the image.
               F1

                    Press to display helpful information about animate(1).
               Ctl-q

                    Press to discard all images and exit program.

X RESOURCES

       Animate  options  can  appear on the command line or in your X resource
       file. Options on the command line supersede values specified in your  X
       resource file. See X(1) for more information on X resources.

       All  animate  options have a corresponding X resource. In addition, the
       animate program uses the following X resources:

               background (class Background)

                    Specifies the preferred color to use for the Image  window
                    background. The default is #ccc.
               borderColor (class BorderColor)

                    Specifies  the preferred color to use for the Image window
                    border. The default is #ccc.
               borderWidth (class BorderWidth)

                    Specifies the width in pixels of the Image window  border.
                    The default is 2.
               font (class Font or FontList)

                    Specifies  the name of the preferred font to use in normal
                    formatted text.  The default is 14 point Helvetica.
               foreground (class Foreground)

                    Specifies the preferred color to use for text  within  the
                    Image window.  The default is black.
               geometry (class geometry)

                    Specifies  the  preferred  size  and position of the image
                    window.  It  is  not  necessarily  obeyed  by  all  window
                    managers.  Offsets, if present, are handled in X(1) style.
                    A negative x offset is measured from the right edge of the
                    screen  to  the  right  edge of the icon, and a negative y
                    offset is measured from the bottom edge of the  screen  to
                    the bottom edge of the icon.
               iconGeometry (class IconGeometry)

                    Specifies   the   preferred   size  and  position  of  the
                    application when iconified.  It is not necessarily  obeyed
                    by  all window managers.  Offsets, if present, are handled
                    in the same manner as in class Geometry.
               iconic (class Iconic)

                    This resource indicates that you  would  prefer  that  the
                    application's  windows  initially not be visible as if the
                    windows  had  be  immediately  iconified  by  you.  Window
                    managers   may  choose  not  to  honor  the  application's
                    request.
               matteColor (class MatteColor)

                    Specify  the  color  of  windows.  It  is  used  for   the
                    backgrounds of windows, menus, and notices. A 3D effect is
                    achieved by using highlight and shadow colors derived from
                    this color. Default value: #ddd.
               name (class Name)

                    This resource specifies the name under which resources for
                    the application should be found. This resource  is  useful
                    in  shell aliases to distinguish between invocations of an
                    application, without resorting to creating links to  alter
                    the  executable  file name. The default is the application
                    name.
               sharedMemory (class SharedMemory)

                    This resource specifies whether animate should attempt use
                    shared  memory  for  pixmaps. ImageMagick must be compiled
                    with shared memory support, and the display  must  support
                    the   MIT-SHM   extension.  Otherwise,  this  resource  is
                    ignored. The default is True.
               text_font (class textFont)

                    Specifies the name of the preferred font to use  in  fixed
                    (typewriter style) formatted text. The default is 14 point
                    Courier.
               title (class Title)

                    This resource specifies the title to be used for the Image
                    window.  This  information  is  sometimes used by a window
                    manager to provide some sort  of  header  identifying  the
                    window. The default is the image file name.

GM COMPARE

       compare  compares  two  similar  images  using  a specified statistical
       method (see -metric) and/or by writing a difference image (-file), with
       the  altered pixels annotated using a specified method (see -highlight-
       style)  and  color  (see  -highlight-color).  Reference-image  is   the
       original  image  and  compare-image  is the (possibly) altered version,
       which should have the same dimensions as reference-image.

EXAMPLES

       To compare  two  images  using  Mean  Square  Error  (MSE)  statistical
       analysis use:

           gm compare -metric mse original.miff compare.miff

       To create an annotated difference image use:

           gm compare -algorithm annotate -highlight-color purple
                   -file diff.miff original.miff compare.miff

OPTIONS

       Options  are processed in command line order. Any option you specify on
       the command line remains in effect only for  the  image  that  follows.
       All options are reset to their default values after each image is read.

       For a more detailed description of each option, see Options, above.

       -authenticate <string>
              decrypt image with this password

       -colorspace <value>
              the type of colorspace

       -debug <events>
              enable debug printout

       -define <key>{=<value>},...
              add coder/decoder specific options

       -density <width>x<height>
              horizontal and vertical resolution in pixels of the image

       -depth <value>
              depth of the image

       -display <host:display[.screen]>
              specifies the X server to contact

       -endian <type>
              specify endianness (MSB, LSB, or Native) of image

       -file <filename>
              write annotated difference image to file

       -help  print usage instructions

       -highlight-color <color>
              pixel annotation color

       -highlight-style <style>
              pixel annotation style

       -interlace <type>
              the type of interlacing scheme

       -limit <type> <value>
              Disk, File, Map, Memory, Pixels, or Threads resource limit

       -log <string>
              Specify format for debug log

       -matte store matte channel if the image has one

       -maximum-error <limit>
              specifies the maximum amount of total image error

       -monitor
              show progress indication

       -sampling-factor <horizontal_factor>x<vertical_factor>
              chroma subsampling factors

       -size <width>x<height>{+offset}
              width and height of the image

       -type <type>
              the image type

       -verbose
              print detailed information about the image

       -version
              print GraphicsMagick version string

              For  a  more  detailed  description of each option, see Options,
              above.

GM COMPOSITE

       composite composites (combines) images to  create  new  images.   base-
       image  is the base image and change-image contains the changes.  ouput-
       image is the result, and normally has  the  same  dimensions  as  base-
       image.

       The  optional mask-image can be used to provide opacity information for
       change-image when it has none or if you want a different mask.  A  mask
       image  is typically grayscale and the same size as base-image. If mask-
       image is not grayscale, it is converted to grayscale and the  resulting
       intensities are used as opacity information.

EXAMPLES

       To composite an image of a cockatoo with a perch, use:

           gm composite cockatoo.miff perch.ras composite.miff

       To compute the difference between images in a series, use:

           gm composite -compose difference series.2 series.1
                     difference.miff

       To  composite  an image of a cockatoo with a perch starting at location
       (100,150), use:

           gm composite -geometry +100+150 cockatoo.miff
                     perch.ras composite.miff

       To tile a logo across your image of a cockatoo, use

           gm convert +shade 30x60 cockatoo.miff mask.miff
           gm composite -compose bumpmap -tile logo.png
                     cockatoo.miff mask.miff composite.miff

       To composite a red, green, and blue color plane into a single composite
       image, try

           gm composite -compose CopyGreen green.png red.png
                     red-green.png
           gm composite -compose CopyBlue blue.png red-green.png
                     gm composite.png

OPTIONS

       Options  are processed in command line order. Any option you specify on
       the command line remains in effect only for  the  image  that  follows.
       All options are reset to their default values after each image is read.

       For a more detailed description of each option, see Options, above.

       -authenticate <string>
              decrypt image with this password

       -background <color>
              the background color

       -blue-primary <x>,<y>
              blue chromaticity primary point

       -colors <value>
              preferred number of colors in the image

       -colorspace <value>
              the type of colorspace

       -comment <string>
              annotate an image with a comment

       -compose <operator>
              the type of image composition

       -compress <type>
              the type of image compression

       -debug <events>
              enable debug printout

       -define <key>{=<value>},...
              add coder/decoder specific options

       -density <width>x<height>
              horizontal and vertical resolution in pixels of the image

       -depth <value>
              depth of the image

       -displace <horizontal scale>x<vertical scale>
              shift image pixels as defined by a displacement map

       -display <host:display[.screen]>
              specifies the X server to contact

       -dispose <method>
              GIF disposal method

       -dissolve <percent>
              dissolve an image into another by the given percent

       -dither
              apply Floyd/Steinberg error diffusion to the image

       -encoding <type>
              specify the text encoding

       -endian <type>
              specify endianness (MSB, LSB, or Native) of image

       -filter <type>
              use this type of filter when resizing an image

       -font <name>
              use this font when annotating the image with text

       -geometry <width>x<height>{+-}<x>{+-}<y>{%}{@}{!}{^}{<}{>}
              preferred size and location of the Image window.

       -gravity <type>
              direction primitive  gravitates to when annotating the image.

       -green-primary <x>,<y>
              green chromaticity primary point

       -help  print usage instructions

       -interlace <type>
              the type of interlacing scheme

       -label <name>
              assign a label to an image

       -limit <type> <value>
              Disk, File, Map, Memory, Pixels, or Threads resource limit

       -log <string>
              Specify format for debug log

       -matte store matte channel if the image has one

       -monitor
              show progress indication

       -monochrome
              transform the image to black and white

       -negate
              replace every pixel with its complementary color

       -page <width>x<height>{+-}<x>{+-}<y>{%}{!}{<}{>}
              size and location of an image canvas

       -profile <filename>
              add ICM, IPTC, or generic profile  to image

       -quality <value>
              JPEG/MIFF/PNG/TIFF compression level

       -recolor <matrix>
              apply a color translation matrix to image channels

       -red-primary <x>,<y>
              red chromaticity primary point

       -render
              render vector operations

       -resize <width>x<height>{%}{@}{!}{<}{>}
              resize an image

       -rotate <degrees>{<}{>}
              rotate the image

       -sampling-factor <horizontal_factor>x<vertical_factor>
              chroma subsampling factors

       -scene <value>
              set scene number

       -set <attribute> <value>
              set an image attribut

       -sharpen <radius>{x<sigma>}
              sharpen the image

       -size <width>x<height>{+offset}
              width and height of the image

       -stegano <offset>
              hide watermark within an image

       -stereo
              composite two images to create a stereo anaglyph

       -thumbnail <width>x<height>{%}{@}{!}{<}{>}
              resize an image (quickly)

       -treedepth <value>
              tree depth for the color reduction algorithm

       -trim  trim an image

       -type <type>
              the image type

       -units <type>
              the units of image resolution

       -unsharp <radius>{x<sigma>}{+<amount>}{+<threshold>}
              sharpen the image with an unsharp mask operator

       -verbose
              print detailed information about the image

       -version
              print GraphicsMagick version string

       -watermark <brightness>x<saturation>
              percent brightness and saturation of a watermark

       -white-point <x>,<y>
              chromaticity white point

       -write <filename>
              write an intermediate image [convert, composite]

              For  a  more  detailed  description of each option, see Options,
              above.

GM CONJURE

       The Magick scripting language (MSL) will primarily benefit  those  that
       want  to  accomplish  custom  image processing tasks but do not wish to
       program, or those that do not have access to a Perl  interpreter  or  a
       compiler.   The  interpreter  is  called conjure and here is an example
       script:

           <?xml version="1.0" encoding="UTF-8"?>
           <image size="400x400" >
             <read filename="image.gif" />
             <get width="base-width" height="base-height" />
             <resize geometry="%[dimensions]" />
             <get width="width" height="height" />
             <print output=
               "Image sized from %[base-width]x%[base-height]
                to %[width]x%[height].\n" />
             <write filename="image.png" />
           </image>

       invoked with

           gm conjure -dimensions 400x400 incantation.msl

       All operations will closely  follow  the  key/value  pairs  defined  in
       PerlMagick, unless otherwise noted.

OPTIONS

       Options  are processed in command line order. Any option you specify on
       the command line remains in effect until it is  explicitly  changed  by
       specifying  the  option  again  with  a  different  effect, or if it is
       changed by a statement in the scripting language.

       You can define your own keyword/value pairs on the command  line.   The
       script  can  then use this information when setting values by including
       %[keyword] in the string.  For example, if  you  included  "-dimensions
       400x400"  on  the  command  line, as illustrated above, then any string
       containing  "%[dimensions]"  would  have  400x400   substituted.    The
       "%[string]"   can   be   used   either   an   entire  string,  such  as
       geometry="%[dimensions]"  or  as  a  part   of   a   string   such   as
       filename="%[basename].png".

       The keyword can be any string except for the following reserved strings
       (in any upper, lower, or mixed case variant): debug, help, and verbose,
       whose usage is described below.

       The  value  can  be  any  string.   If  either the keyword or the value
       contains white space or any symbols that have special meanings to  your
       shell  such  as "#", "|", or "%", enclose the string in quotation marks
       or use "\" to escape the white space and special symbols.

       Keywords and values are case dependent.  "Key", "key", and "KEY"  would
       be three different keywords.

       For a more detailed description of each option, see Options, above.

       -debug <events>
              enable debug printout

       -define <key>{=<value>},...
              add coder/decoder specific options

       -help  print usage instructions

       -log <string>
              Specify format for debug log

       -verbose
              print detailed information about the image

       -version
              print GraphicsMagick version string

MAGICK SCRIPTING LANGUAGE

       The  Magick  Scripting  Language  (MSL) presently defines the following
       elements and their attributes:

               <image>

                    background, color, id, size

                    Define a new image object.  </image> destroys it.  Because
                    of  this,  if  you  wish to reference multiple "subimages"
                    (aka pages or layers), you can  embed  one  image  element
                    inside of another. For example:

                        <image>
                        <read filename="input.png" />
                        <get width="base-width" height="base-height" />
                        <image height="base-height" width="base-width">
                        <image />
                        <write filename="output.mng" />
                        </image>

                        <image size="400x400" />

               <group>

                    Define  a  new group of image objects.  By default, images
                    are only valid for the life of their <image>element.

                        <image>   -- creates the image
                        .....     -- do stuff with it
                        </image>  -- dispose of the image

                    However, in a group, all images in that  group  will  stay
                    around for the life of the group:

                        <group>                           -- start a group
                            <image>                       -- create an image
                            ....                          -- do stuff
                            </image>                      -- NOOP
                            <image>                        --  create  another
                    image
                            ....                          -- do more stuff
                            </image>                      -- NOOP
                            <write filename="image.mng" />  -- output
                        </group>                          -- dispose  of  both
                    images

               <read>

                        filename

                    Read a new image from a disk file.

                        <read filename="image.gif" />

                    To read two images use

                        <read filename="image.gif" />
                        <read filename="image.png />

               <write>

                        filename
                    Write  the  image(s) to disk, either as a single multiple-
                    image file or multiple ones if necessary.

                         <write filename=image.tiff" />
               <get>

                    Get   any    attribute    recognized    by    PerlMagick's
                    GetAttribute()  and  stores  it  as an image attribute for
                    later use. Currently only width and height are supported.

                        <get width="base-width" height="base-height" />
                        <print  output="Image  size  is  %[base-width]x%[base-
                    height].\n" />

               <set>

                    background,  bordercolor,  clip-mask, colorspace, density,
                    magick, mattecolor, opacity.  Set an attribute  recognized
                    by PerlMagick's GetAttribute().
               <profile>

                        [profilename]

                    Read  one  or more IPTC, ICC or generic profiles from file
                    and assign to image

                        <profile iptc="profile.iptc" generic="generic.dat" />

                    To remove a specified profile use "!" as the filename eg

                        <profile icm="!" iptc="profile.iptc" />

               <border>

                        fill, geometry, height, width
               <blur>

                        radius, sigma
               <charcoal>

                        radius, sigma
               <chop>

                        geometry, height, width, x, y
               <crop>

                        geometry, height, width, x, y
               <composite>

                        compose, geometry, gravity, image, x, y

                        <?xml version="1.0" encoding="UTF-8"?>
                        <group>
                            <image id="image_01">
                                <read filename="cloud3.gif"/>
                                <resize geometry="250x90"/>
                            </image>
                            <image id="image_02">
                                <read filename="cloud4.gif"/>
                                <resize geometry="190x100"/>
                            </image>
                            <image>
                                <read filename="background.jpg"/>
                                <composite                    image="image_01"
                    geometry="+740+470"/>
                                <composite                    image="image_02"
                    geometry="+390+415"/>
                            </image>
                            <write filename="result.png"/>
                        </group>

               <despeckle>

               <emboss>

                        radius, sigma
               <enhance>

               <equalize>

               <edge>

                        radius
               <flip>

               <flop>

               <frame>

                        fill, geometry, height, width, x, y, inner, outer
               <flatten>

               <get>

                        height, width
               <gamma>

                        red, green, blue
               <image>

                        background, color, id, size
               <implode>

                        amount
               <magnify>

               <minify>

               <medianfilter>

                        radius
               <normalize>

               <oilpaint>

                        radius
               <print>

                        output
               <profile>

                        [profilename]
               <read>

               <resize>

                        blur, filter, geometry, height, width
               <roll>

                        geometry, x, y
               <rotate>

                        degrees
               <reducenoise>

                        radius
               <sample>

                        geometry, height, width
               <scale>

                        geometry, height, width
               <sharpen>

                        radius, sigma
               <shave>

                        geometry, height, width
               <shear>

                        x, y
               <solarize>

                        threshold
               <spread>

                        radius
               <stegano>

                        image
               <stereo>

                        image
               <swirl>

                        degrees
               <texture>

                        image
               <threshold>

                        threshold
               <transparent>

                        color
               <trim>

       GM CONVERT

              Convert converts an input file using  one  image  format  to  an
              output  file with a differing image format. In addition, various
              types of image processing can  be  performed  on  the  converted
              image  during  the  conversion  process.  Convert recognizes the
              image formats listed in GraphicsMagick(1).

EXAMPLES

       To make a thumbnail of a JPEG image, use:

           gm convert -size 120x120 cockatoo.jpg -resize 120x120
                   +profile "*" thumbnail.jpg

       In this example, '-size 120x120' gives a hint to the JPEG decoder  that
       the  image  is  going  to  be downscaled to 120x120, allowing it to run
       faster by avoiding returning full-resolution images  to  GraphicsMagick
       for the subsequent resizing operation.  The ´-resize 120x120' specifies
       the desired dimensions of the output image.  It will be scaled  so  its
       largest  dimension  is 120 pixels.  The ´+profile "*"' removes any ICM,
       EXIF, IPTC, or other profiles that might be present in  the  input  and
       aren't needed in the thumbnail.

       To convert a MIFF image of a cockatoo to a SUN raster image, use:

           gm convert cockatoo.miff sun:cockatoo.ras

       To  convert  a  multi-page PostScript document to individual FAX pages,
       use:

           gm convert -monochrome document.ps fax:page

       To convert a TIFF image to a PostScript A4 page with the image  in  the
       lower left-hand corner, use:

           gm convert -page A4+0+0 image.tiff document.ps

       To  convert  a  raw  Gray  image  with  a 128 byte header to a portable
       graymap, use:

           gm convert -depth 8 -size 768x512+128 gray:raw
                   image.pgm

       In this example, "raw" is the input file.  Its format is "gray" and  it
       has  the  dimensions  and number of header bytes specified by the -size
       option and the sample depth specified by the -depth option.  The output
       file is "image.pgm".  The suffix ".pgm" specifies its format.

       To convert a Photo CD image to a TIFF image, use:

           gm convert -size 1536x1024 img0009.pcd image.tiff
           gm convert img0009.pcd[4] image.tiff

       To create a visual image directory of all your JPEG images, use:

           gm convert 'vid:*.jpg' directory.miff

       To  annotate  an  image  with  blue  text  using font 12x24 at position
       (100,100), use:

           gm convert -font helvetica -fill blue
                   -draw "text 100,100 Cockatoo"
                   bird.jpg bird.miff

       To tile a 640x480 image with a JPEG texture with bumps use:

           gm convert -size 640x480 tile:bumps.jpg tiled.png

       To surround an icon with an ornamental border to  use  with  Mosaic(1),
       use:

           gm convert -mattecolor "#697B8F" -frame 6x6 bird.jpg
                   icon.png

       To create a MNG animation from a DNA molecule sequence, use:

           gm convert -delay 20 dna.* dna.mng

OPTIONS

       Options  are processed in command line order. Any option you specify on
       the command line remains in effect for the set of images that  follows,
       until  the  set is terminated by the appearance of any option or -noop.
       Some options only affect the decoding of images  and  others  only  the
       encoding.  The latter can appear after the final group of input images.

       For a more detailed description of each option, see Options, above.

       -adjoin
              join images into a single multi-image file

       -affine <matrix>
              drawing transform matrix

       -antialias
              remove pixel aliasing

       -append
              append a set of images

        -asc-cdl <spec>
              apply ASC CDL color transform

       -authenticate <string>
              decrypt image with this password

       -average
              average a set of images

       -background <color>
              the background color

       -black-threshold red[,green][,blue][,opacity]
              pixels below the threshold become black

       -blue-primary <x>,<y>
              blue chromaticity primary point

       -blur <radius>{x<sigma>}
              blur the image with a Gaussian operator

       -border <width>x<height>
              surround the image with a border of color

       -bordercolor <color>
              the border color

       -box <color>
              set the color of the annotation bounding box

       -channel <type>
              the type of channel

       -charcoal <factor>
              simulate a charcoal drawing

       -chop <width>x<height>{+-}<x>{+-}<y>{%}
              remove pixels from the interior of an image

       -clip  apply the clipping path, if one is present

       -coalesce
              merge a sequence of images

       -colorize <value>
              colorize the image with the pen color

       -colors <value>
              preferred number of colors in the image

       -colorspace <value>
              the type of colorspace

       -comment <string>
              annotate an image with a comment

       -compose <operator>
              the type of image composition

       -compress <type>
              the type of image compression

       -contrast
              enhance or reduce the image contrast

       -convolve <kernel>
              convolve image with the specified convolution kernel

       -crop <width>x<height>{+-}<x>{+-}<y>{%}
              preferred size and location of the cropped image

       -cycle <amount>
              displace image colormap by amount

       -debug <events>
              enable debug printout

       -deconstruct
              break down an image sequence into constituent parts

       -define <key>{=<value>},...
              add coder/decoder specific options

       -delay <1/100ths of a second>
              display the next image after pausing

       -density <width>x<height>
              horizontal and vertical resolution in pixels of the image

       -depth <value>
              depth of the image

       -despeckle
              reduce the speckles within an image

       -display <host:display[.screen]>
              specifies the X server to contact

       -dispose <method>
              GIF disposal method

       -dither
              apply Floyd/Steinberg error diffusion to the image

       -draw <string>
              annotate an image with one or more graphic primitives

       -edge <radius>
              detect edges within an image

       -emboss <radius>
              emboss an image

       -encoding <type>
              specify the text encoding

       -endian <type>
              specify endianness (MSB, LSB, or Native) of image

       -enhance
              apply a digital filter to enhance a noisy image

       -equalize
              perform histogram equalization to the image

       -extent <width>x<height>{+-}<x>{+-}<y>
              composite image on background color canvas image

       -fill <color>
              color to use when filling a graphic primitive

       -filter <type>
              use this type of filter when resizing an image

       -flatten
              flatten a sequence of images

       -flip  create a "mirror image"

       -flop  create a "mirror image"

       -font <name>
              use this font when annotating the image with text

       -frame <width>x<height>+<outer bevel width>+<inner bevel width>
              surround the image with an ornamental border

       -fuzz <distance>{%}
              colors within this Euclidean distance are considered equal

       -gamma <value>
              level of gamma correction

       -gaussian <radius>{x<sigma>}
              blur the image with a Gaussian operator

       -geometry <width>x<height>{+-}<x>{+-}<y>{%}{@}{!}{^}{<}{>}
              preferred size and location of the Image window.

       -gravity <type>
              direction primitive  gravitates to when annotating the image.

       -green-primary <x>,<y>
              green chromaticity primary point

       -hald-clut <clut>
              apply a Hald CLUT to the image

       -help  print usage instructions

       -implode <factor>
              implode image pixels about the center

       -intent <type>
              use this type of rendering intent when managing the image color

       -interlace <type>
              the type of interlacing scheme

       -label <name>
              assign a label to an image

       -lat <width>x<height>{+-}<offset>{%}
              perform local adaptive thresholding

       -level <black_point>{,<gamma>}{,<white_point>}{%}
              adjust the level of image contrast

       -limit <type> <value>
              Disk, File, Map, Memory, Pixels, or Threads resource limit

       -list <type>
              the type of list

       -log <string>
              Specify format for debug log

       -loop <iterations>
              add Netscape loop extension to your GIF animation

       -magnify
              magnify the image

       -map <filename>
              choose a particular set of colors from this image

       -mask <filename>
              Specify a clipping mask

       -matte store matte channel if the image has one

       -mattecolor <color>
              specify the color to be used with the -frame option

       -median <radius>
              apply a median filter to the image

       -minify <factor>
              minify the image

       -modulate brightness[,saturation[,hue]]
              vary the brightness, saturation, and hue of an image

       -monitor
              show progress indication

       -monochrome
              transform the image to black and white

       -morph <frames>
              morphs an image sequence

       -mosaic
              create a mosaic from an image or an image sequence

       -motion-blur <radius>{x<sigma>}{+angle}
              Simulate motion blur

       -negate
              replace every pixel with its complementary color

       -noise <radius|type>
              add or reduce noise in an image

       -noop  NOOP (no option)

       -normalize
              transform image to span the full range of color values

       -opaque <color>
              change this color to the pen color within the image

       -operator channel operator rvalue[%]
              apply  a  mathematical,  bitwise,  or value operator to an image
              channel

       -ordered-dither <channeltype> <NxN>
              ordered dither the image

       -page <width>x<height>{+-}<x>{+-}<y>{%}{!}{<}{>}
              size and location of an image canvas

       -paint <radius>
              simulate an oil painting

       -pen <color>
              (This option has been replaced by the -fill option)

       -ping  efficiently determine image characteristics

       -pointsize <value>
              pointsize of the PostScript, X11, or TrueType font

       -preview <type>
              image preview type

       -process <command>
              process a sequence of images using a process module

       -profile <filename>
              add ICM, IPTC, or generic profile  to image

       -quality <value>
              JPEG/MIFF/PNG/TIFF compression level

       -raise <width>x<height>
              lighten or darken image edges

       -random-threshold <channeltype> <LOWxHIGH>
              random threshold the image

       -recolor <matrix>
              apply a color translation matrix to image channels

       -red-primary <x>,<y>
              red chromaticity primary point

       -region <width>x<height>{+-}<x>{+-}<y>
              apply options to a portion of the image

       -render
              render vector operations

       -resample <horizontal>x<vertical>
              Resample image to specified horizontal and vertical resolution

       -resize <width>x<height>{%}{@}{!}{<}{>}
              resize an image

       -roll {+-}<x>{+-}<y>
              roll an image vertically or horizontally

       -rotate <degrees>{<}{>}
              rotate the image

       -sample <geometry>
              scale image using pixel sampling

       -sampling-factor <horizontal_factor>x<vertical_factor>
              chroma subsampling factors

       -scale <geometry>
              scale the image.

       -scene <value>
              set scene number

       -set <attribute> <value>
              set an image attribut

       -segment <cluster threshold>x<smoothing threshold>
              segment an image

       -shade <azimuth>x<elevation>
              shade the image using a distant light source

       -sharpen <radius>{x<sigma>}
              sharpen the image

       -shave <width>x<height>{%}
              shave pixels from the image edges

       -shear <x degrees>x<y degrees>
              shear the image along the X or Y axis

       -size <width>x<height>{+offset}
              width and height of the image

       -solarize <factor>
              negate all pixels above the threshold level

       -spread <amount>
              displace image pixels by a random amount

       -stroke <color>
              color to use when stroking a graphic primitive

       -strokewidth <value>
              set the stroke width

       -swirl <degrees>
              swirl image pixels about the center

       -texture <filename>
              name of texture to tile onto the image background

       -threshold <value>{%}
              threshold the image

       -thumbnail <width>x<height>{%}{@}{!}{<}{>}
              resize an image (quickly)

       -tile <filename>
              tile image when filling a graphic primitive

       -transform
              transform the image

       -transparent <color>
              make this color transparent within the image

       -treedepth <value>
              tree depth for the color reduction algorithm

       -trim  trim an image

       -type <type>
              the image type

       -units <type>
              the units of image resolution

       -unsharp <radius>{x<sigma>}{+<amount>}{+<threshold>}
              sharpen the image with an unsharp mask operator

       -use-pixmap
              use the pixmap

       -verbose
              print detailed information about the image

       -version
              print GraphicsMagick version string

       -view <string>
              FlashPix viewing parameters

       -virtual-pixel <method>
              specify contents of "virtual pixels"

       -wave <amplitude>x<wavelength>
              alter an image along a sine wave

       -white-point <x>,<y>
              chromaticity white point

       -white-threshold red[,green][,blue][,opacity]
              pixels above the threshold become white

       -write <filename>
              write an intermediate image [convert, composite]

              For a more detailed description of  each  option,  see  Options,
              above.

GM DISPLAY

       Display  is  a  machine  architecture  independent image processing and
       display program. It can display an  image  on  any  workstation  screen
       running  an  X  server.  Display  can  read  and write many of the more
       popular image formats (e.g. JPEG, TIFF, PNM, Photo CD, etc.).

       With display, you can perform these functions on an image:

                o  load an image from a file
                o  display the next image
                o  display the former image
                o  display a sequence of images as a slide show
                o  write the image to a file
                o  print the image to a PostScript printer
                o  delete the image file
                o  create a Visual Image Directory
                o  select the image to display by its  thumbnail  rather  than
               name
                o  undo last image transformation
                o  copy a region of the image
                o  paste a region to the image
                o  restore the image to its original size
                o  refresh the image
                o  half the image size
                o  double the image size
                o  resize the image
                o  crop the image
                o  cut the image
                o  flop image in the horizontal direction
                o  flip image in the vertical direction
                o  rotate the image 90 degrees clockwise
                o  rotate the image 90 degrees counter-clockwise
                o  rotate the image
                o  shear the image
                o  roll the image
                o  trim the image edges
                o  invert the colors of the image
                o  vary the color brightness
                o  vary the color saturation
                o  vary the image hue
                o  gamma correct the image
                o  sharpen the image contrast
                o  dull the image contrast
                o  perform histogram equalization on the image
                o  perform histogram normalization on the image
                o  negate the image colors
                o  convert the image to grayscale
                o  set the maximum number of unique colors in the image
                o  reduce the speckles within an image
                o  eliminate peak noise from an image
                o  detect edges within the image
                o  emboss an image
                o  segment the image by color
                o  simulate an oil painting
                o  simulate a charcoal drawing
                o  annotate the image with text
                o  draw on the image
                o  edit an image pixel color
                o  edit the image matte information
                o  composite an image with another
                o  add a border to the image
                o  surround image with an ornamental border
                o  apply image processing techniques to a region of interest
                o  display information about the image
                o  zoom a portion of the image
                o  show a histogram of the image
                o  display image to background of a window
                o  set user preferences
                o  display information about this program
                o  discard all images and exit program
                o  change the level of magnification
                o   display images specified by a World Wide Web (WWW) uniform
               resource locator (URL)

EXAMPLES

       To scale an image of a cockatoo to exactly 640 pixels in width and  480
       pixels in height and position the window at location (200,200), use:

           gm display -geometry 640x480+200+200! cockatoo.miff

       To  display  an  image  of  a  cockatoo  without a border centered on a
       backdrop, use:

           gm display +borderwidth -backdrop cockatoo.miff

       To tile a slate texture onto the root window, use:

           gm display -size 1280x1024 -window root slate.png

       To display a visual image directory of all your JPEG images, use:

           gm display 'vid:*.jpg'

       To display a MAP image that is 640 pixels in width and  480  pixels  in
       height with 256 colors, use:

           gm display -size 640x480+256 cockatoo.map

       To display an image of a cockatoo specified with a World Wide Web (WWW)
       uniform resource locator (URL), use:

           gm display ftp://wizards.dupont.com/images/cockatoo.jpg

       To display histogram of an image, use:

           gm gm convert file.jpg HISTOGRAM:- | gm display -

OPTIONS

       Options are processed in command line order. Any option you specify  on
       the  command  line  remains in effect until it is explicitly changed by
       specifying the option again with a different  effect.  For  example  to
       display  three  images,  the  first  with 32 colors, the second with an
       unlimited number of colors, and the third with only 16 colors, use:

             gm display -colors 32 cockatoo.miff -noop duck.miff
                        -colors 16 macaw.miff

       Display options can appear on the command line or in your  X  resources
       file.  See X(1). Options on the command line supersede values specified
       in your X resources file.

       For a more detailed description of each option, see Options, above.

       -authenticate <string>
              decrypt image with this password

       -backdrop
              display the image centered on a backdrop.

       -background <color>
              the background color

       -border <width>x<height>
              surround the image with a border of color

       -bordercolor <color>
              the border color

       -borderwidth <geometry>
              the border width

       -colormap <type>
              define the colormap type

       -colors <value>
              preferred number of colors in the image

       -colorspace <value>
              the type of colorspace

       -comment <string>
              annotate an image with a comment

       -compress <type>
              the type of image compression

       -contrast
              enhance or reduce the image contrast

       -crop <width>x<height>{+-}<x>{+-}<y>{%}
              preferred size and location of the cropped image

       -debug <events>
              enable debug printout

       -define <key>{=<value>},...
              add coder/decoder specific options

       -delay <1/100ths of a second>
              display the next image after pausing

       -density <width>x<height>
              horizontal and vertical resolution in pixels of the image

       -depth <value>
              depth of the image

       -despeckle
              reduce the speckles within an image

       -display <host:display[.screen]>
              specifies the X server to contact

       -dispose <method>
              GIF disposal method

       -dither
              apply Floyd/Steinberg error diffusion to the image

       -edge <radius>
              detect edges within an image

       -endian <type>
              specify endianness (MSB, LSB, or Native) of image

       -enhance
              apply a digital filter to enhance a noisy image

       -filter <type>
              use this type of filter when resizing an image

       -flip  create a "mirror image"

       -flop  create a "mirror image"

       -font <name>
              use this font when annotating the image with text

       -foreground <color>
              define the foreground color

       -frame <width>x<height>+<outer bevel width>+<inner bevel width>
              surround the image with an ornamental border

       -gamma <value>
              level of gamma correction

       -geometry <width>x<height>{+-}<x>{+-}<y>{%}{@}{!}{^}{<}{>}
              preferred size and location of the Image window.

       -help  print usage instructions

       -iconGeometry <geometry>
              specify the icon geometry

       -iconic
              iconic animation

       -immutable
              make image immutable

       -interlace <type>
              the type of interlacing scheme

       -label <name>
              assign a label to an image

       -limit <type> <value>
              Disk, File, Map, Memory, Pixels, or Threads resource limit

       -log <string>
              Specify format for debug log

       -magnify <factor>
              magnify the image

       -map <type>
              display image using this type.

       -matte store matte channel if the image has one

       -mattecolor <color>
              specify the color to be used with the -frame option

       -monitor
              show progress indication

       -monochrome
              transform the image to black and white

       -name  name an image

       -negate
              replace every pixel with its complementary color

       -noop  NOOP (no option)

       -page <width>x<height>{+-}<x>{+-}<y>{%}{!}{<}{>}
              size and location of an image canvas

       +progress
              disable progress monitor and busy cursor

       -quality <value>
              JPEG/MIFF/PNG/TIFF compression level

       -raise <width>x<height>
              lighten or darken image edges

       -remote
              perform a X11 remote operation

       -roll {+-}<x>{+-}<y>
              roll an image vertically or horizontally

       -rotate <degrees>{<}{>}
              rotate the image

       -sample <geometry>
              scale image using pixel sampling

       -sampling-factor <horizontal_factor>x<vertical_factor>
              chroma subsampling factors

       -scenes <value-value>
              range of image scene numbers to read

       -set <attribute> <value>
              set an image attribut

       -segment <cluster threshold>x<smoothing threshold>
              segment an image

       -shared-memory
              use shared memory

       -sharpen <radius>{x<sigma>}
              sharpen the image

       -size <width>x<height>{+offset}
              width and height of the image

       -text-font <name>
              font for writing fixed-width text

       -texture <filename>
              name of texture to tile onto the image background

       -title <string>
              assign title to displayed image [animate, display, montage]

       -treedepth <value>
              tree depth for the color reduction algorithm

       -trim  trim an image

       -type <type>
              the image type

       -update <seconds>
               detect when image file is modified and redisplay.

       -use-pixmap
              use the pixmap

       -verbose
              print detailed information about the image

       -version
              print GraphicsMagick version string

       -visual <type>
              animate images using this X visual type

       -window <id>
              make image the background of a window

       -window-group
              specify the window group

       -write <filename>
              write the image to a file [display]

              For a more detailed description of  each  option,  see  Options,
              above.

MOUSE BUTTONS

       The  effects of each button press is described below. Three buttons are
       required. If you have a two button mouse, button 1 and 3 are  returned.
       Press ALT and button 3 to simulate button 2.

       1        Press this button to map or unmap the Command widget . See the
              next section for more information about the Command widget.

       2       Press and drag to define a region of the image to magnify.

       3       Press and drag to  choose  from  a  select  set  of  display(1)
              commands.  This  button  behaves  differently if the image being
              displayed is a visual image directory. Choose a particular  tile
              of  the  directory  and  press  this button and drag to select a
              command from a pop-up menu.  Choose from these menu items:

                  Open
                  Next
                  Former
                  Delete
                  Update

              If you choose  Open,  the  image  represented  by  the  tile  is
              displayed.  To return to the visual image directory, choose Next
              from the Command widget (refer to  Command  Widget).   Next  and
              Former  moves  to  the next or former image respectively. Choose
              Delete to delete a particular image tile. Finally, choose Update
              to synchronize all the image tiles with their respective images.
              See montage and miff for more details.

COMMAND WIDGET

       The Command widget lists a number of sub-menus and commands. They are

           File

           Open...
           Next
           Former
           Select...
           Save...
           Print...
           Delete...
           Canvas...
           Visual Directory...
           Quit

           Edit

           Undo
           Redo
           Cut
           Copy
           Paste

           View

           Half Size
           Original Size
           Double Size
           Resize...
           Apply
           Refresh
           Restore

           Transform

           Crop
           Chop
           Flop
           Flip
           Rotate Right
           Rotate Left
           Rotate...
           Shear...
           Roll...
           Trim Edges

           Enhance

           Hue...
           Saturation...
           Brightness...
           Gamma...
           Spiff...
           Dull
           Equalize
           Normalize
           Negate
           GRAYscale
           Quantize...

           Effects

           Despeckle
           Emboss
           Reduce Noise
           Add Noise
           Sharpen...
           Blur...
           Threshold...
           Edge Detect...
           Spread...
           Shade...
           Raise...
           Segment...

           F/X

           Solarize...
           Swirl...
           Implode...
           Wave...
           Oil Paint...
           Charcoal Draw...

           Image Edit

           Annotate...
           Draw...
           Color...
           Matte...
           Composite...
           Add Border...
           Add Frame...
           Comment...
           Launch...
           Region of Interest...

           Miscellany

           Image Info
           Zoom Image
           Show Preview...
           Show Histogram
           Show Matte
           Background...
           Slide Show
           Preferences...

           Help

           Overview
           Browse Documentation
           About Display

       Menu  items  with  a  indented  triangle  have  a  sub-menu.  They  are
       represented  above  as  the  indented items. To access a sub-menu item,
       move the pointer to the appropriate menu and press button 1  and  drag.
       When  you  find  the  desired sub-menu item, release the button and the
       command is executed.  Move the pointer away from the  sub-menu  if  you
       decide not to execute a particular command.

KEYBOARD ACCELERATORS

       Accelerators  are  one  or  two  key  presses  that effect a particular
       command.  The keyboard accelerators that display understands is:

           Ctl+O     Press to load an image from a file.
           space     Press to display the next image.

       If the image is a multi-paged document such as a  PostScript  document,
       you  can  skip  ahead  several  pages  by preceding this command with a
       number.  For example to display the  fourth  page  beyond  the  current
       page, press 4space.

           backspace Press to display the former image.

       If  the  image is a multi-paged document such as a PostScript document,
       you can skip behind several pages by  preceding  this  command  with  a
       number.   For  example to display the fourth page preceding the current
       page, press 4n.

           Ctl-S    Press to save the image to a file.
           Ctl-P    Press to print the image to a
                    PostScript printer.
           Ctl-D    Press to delete an image file.
           Ctl-N    Press to create a blank canvas.
           Ctl-Q    Press to discard all images and exit program.
           Ctl+Z    Press to undo last image transformation.
           Ctl+R    Press to redo last image transformation.
           Ctl-X    Press to cut a region of
                    the image.
           Ctl-C    Press to copy a region of
                    the image.
           Ctl-V    Press to paste a region to
                    the image.
           <        Press to halve the image size.
           .        Press to return to the original image size.
           >        Press to double the image size.
           %        Press to resize the image to a width and height
                    you specify.
           Cmd-A    Press to make any image transformations
                    permanent.
                    By default, any image size transformations are
                    applied to the original image to create the
                    image displayed on the X server.  However, the
                    transformations are not permanent (i.e. the
                    original image does not change size only the
                    X image does). For example, if you press ">"
                    the X image will appear to double in size, but
                    the original image will in fact remain the same
                    size.  To force the original image to double in
                    size, press ">" followed by "Cmd-A".
           @        Press to refresh the image window.
           C        Press to crop the image.
           [        Press to chop the image.
           H        Press to flop image in the horizontal direction.
           V        Press to flip image in the vertical direction.
           /        Press to rotate the image 90 degrees clockwise.
           \        Press to rotate the image 90 degrees
                    counter-clockwise.
           *        Press to rotate the image
                    the number of degrees you specify.
           S        Press to shear the image the number of degrees
                    you specify.
           R        Press to roll the image.
           T        Press to trim the image edges.
           Shft-H   Press to vary the color hue.
           Shft-S   Press to vary the color saturation.
           Shft-L   Press to vary the image brightness.
           Shft-G   Press to gamma correct the image.
           Shft-C   Press to spiff up the image contrast.
           Shft-Z   Press to dull the image contrast.
           =        Press to perform histogram equalization on
                    the image.
           Shft-N   Press to perform histogram normalization on
                    the image.
           Shft-~   Press to negate the colors of the image.
           .        Press to convert the image colors to gray.
           Shft-#   Press to set the maximum number of unique
                    colors in the image.
           F2       Press to reduce the speckles in an image.
           F2       Press to emboss an image.
           F4       Press to eliminate peak noise from an image.
           F5       Press to add noise to an image.
           F6       Press to sharpen an image.
           F7       Press to blur image an image.
           F8       Press to threshold the image.
           F9       Press to detect edges within an image.
           F10      Press to displace pixels by a random amount.
           F11      Press to shade the image using a distant light
                    source.
           F12      Press to lighten or darken image edges to
                    create a 3-D effect.
           F13      Press to segment the image by color.
           Meta-S   Press to swirl image pixels about the center.
           Meta-I   Press to implode image pixels about the center.
           Meta-W   Press to alter an image along a sine wave.
           Meta-P   Press to simulate an oil painting.
           Meta-C   Press to simulate a charcoal drawing.
           Alt-X    Press to composite the image
                    with another.
           Alt-A    Press to annotate the image with text.
           Alt-D    Press to draw a line on the image.
           Alt-P    Press to edit an image pixel color.
           Alt-M    Press to edit the image matte information.
           Alt-X    Press to composite the image with another.
           Alt-A    Press to add a border to the image.
           Alt-F    Press to add a ornamental frame to the image.
           Alt-Shft-!   Press to add an image comment.
           Ctl-A    Press to apply image processing techniques to a
                    region of interest.
           Shft-?   Press to display information about the image.
           Shft-+   Press to map the zoom image window.
           Shft-P   Press to preview an image enhancement, effect,
                    or f/x.
           F1       Press to display helpful information about
                    the "display" utility.
           Find     Press to browse documentation about
                    GraphicsMagick.
           1-9      Press to change the level of magnification.

       Use the arrow keys to move the image one pixel up, down, left, or right
       within  the  magnify window. Be sure to first map the magnify window by
       pressing button 2.

       Press ALT and one of the arrow keys to trim off one pixel from any side
       of the image.

X RESOURCES

       Display  options  can  appear on the command line or in your X resource
       file. Options on the command line supersede values specified in your  X
       resource file. See X(1) for more information on X resources.

       Most  display  options  have  a  corresponding X resource. In addition,
       display uses the following X resources:

       background (class Background)
               Specifies the preferred color  to  use  for  the  Image  window
              background. The default is #ccc.

       borderColor (class BorderColor)
                Specifies  the  preferred  color  to  use for the Image window
              border. The default is #ccc.

       borderWidth (class BorderWidth)
               Specifies the width in pixels of the image window  border.  The
              default is 2.

       browseCommand (class browseCommand)
                Specifies  the  name  of the preferred browser when displaying
              GraphicsMagick documentation. The default is netscape %s.

       confirmExit (class ConfirmExit)
               Display pops up a dialog box to  confirm  exiting  the  program
              when  exiting  the  program.  Set this resource to False to exit
              without a confirmation.

       displayGamma (class DisplayGamma)
               Specifies the gamma of the X server.  You  can  apply  separate
              gamma  values  to the red, green, and blue channels of the image
              with  a  gamma  value  list  delineated   with   slashes   (i.e.
              1.7/2.3/1.2).  The default is 2.2.

       displayWarnings (class DisplayWarnings)
               Display pops up a dialog box whenever a warning message occurs.
              Set this resource to False to ignore warning messages.

       font (class FontList)
               Specifies the name of the  preferred  font  to  use  in  normal
              formatted text.  The default is 14 point Helvetica.

       font[1-9] (class Font[1-9])
               Specifies the name of the preferred font to use when annotating
              the image  window  with  text.  The  default  fonts  are  fixed,
              variable,  5x8,  6x10,  7x13bold, 8x13bold, 9x15bold, 10x20, and
              12x24.

       foreground (class Foreground)
               Specifies the preferred color to use for text within the  image
              window.  The default is black.

       gammaCorrect (class gammaCorrect)
                This  resource,  if  true,  will lighten or darken an image of
              known gamma to match the gamma  of  the  display  (see  resource
              displayGamma). The default is True.

       geometry (class Geometry)
                Specifies the preferred size and position of the image window.
              It is not necessarily obeyed by all window managers.

              Offsets, if present, are handled in X(1) style.   A  negative  x
              offset  is  measured  from  the  right edge of the screen to the
              right edge of the icon, and a negative y offset is measured from
              the bottom edge of the screen to the bottom edge of the icon.

       iconGeometry (class IconGeometry)
                Specifies  the  preferred size and position of the application
              when iconified.  It is not  necessarily  obeyed  by  all  window
              managers.

              Offsets,  if present, are handled in the same manner as in class
              Geometry.

       iconic (class Iconic)
                This  resource  indicates  that  you  would  prefer  that  the
              application's windows initially not be visible as if the windows
              had be immediately iconified by you. Window managers may  choose
              not to honor the application's request.

       magnify (class Magnify)
                specifies  an  integral  factor  by  which the image should be
              enlarged. The  default  is  3.   This  value  only  affects  the
              magnification window which is invoked with button number 3 after
              the image is displayed.

       matteColor (class MatteColor)
               Specify the color of windows. It is used for the backgrounds of
              windows,  menus,  and  notices. A 3D effect is achieved by using
              highlight and shadow colors derived  from  this  color.  Default
              value: #697B8F.

       name (class Name)
                This resource specifies the name under which resources for the
              application should be found. This resource is  useful  in  shell
              aliases  to  distinguish  between invocations of an application,
              without resorting to creating links to alter the executable file
              name. The default is the application name.

       pen[1-9] (class Pen[1-9])
                Specifies  the  color  of  the  preferred  font  to  use  when
              annotating the image window with text. The  default  colors  are
              black, blue, green, cyan, gray, red, magenta, yellow, and white.

       printCommand (class PrintCommand)
               This command is executed whenever Print is issued.  In general,
              it is the command to print PostScript to your  printer.  Default
              value: lp -c -s %i.

       sharedMemory (class SharedMemory)
                This  resource  specifies  whether  display should attempt use
              shared memory for pixmaps. GraphicsMagick must be compiled  with
              shared  memory support, and the display must support the MIT-SHM
              extension. Otherwise, this resource is ignored. The  default  is
              True.

       textFont (class textFont)
                Specifies  the  name  of  the  preferred  font to use in fixed
              (typewriter style) formatted  text.  The  default  is  14  point
              Courier.

       title (class Title)
                This  resource  specifies  the  title to be used for the image
              window. This information is sometimes used by a  window  manager
              to  provide  a header identifying the window. The default is the
              image file name.

       undoCache (class UndoCache)
               Specifies, in mega-bytes, the amount of memory in the undo edit
              cache.   Each  time you modify the image it is saved in the undo
              edit cache as long as memory is available. You can  subsequently
              undo  one  or  more  of these transformations. The default is 16
              Megabytes.

       usePixmap (class UsePixmap)
               Images are maintained as a XImage by default. Set this resource
              to  True  to  utilize  a  server  Pixmap instead. This option is
              useful if your image  exceeds  the  dimensions  of  your  server
              screen  and  you intend to pan the image. Panning is much faster
              with Pixmaps than  with  a  XImage.  Pixmaps  are  considered  a
              precious resource, use them with discretion.

              To  set  the  geometry  of the Magnify or Pan or window, use the
              geometry resource.  For example, to set the Pan window  geometry
              to 256x256, use:

                  gm display.pan.geometry: 256x256

IMAGE LOADING

       To  select  an  image to display, choose Open of the File sub-menu from
       the  Command  widget.  A  file  browser  is  displayed.   To  choose  a
       particular  image  file, move the pointer to the filename and press any
       button. The filename is copied to the text window. Next, press Open  or
       press  the  RETURN key. Alternatively, you can type the image file name
       directly into  the  text  window.  To  descend  directories,  choose  a
       directory name and press the button twice quickly. A scrollbar allows a
       large list of filenames to be moved through  the  viewing  area  if  it
       exceeds the size of the list area.

       You can trim the list of file names by using shell globbing characters.
       For example, type *.jpg to list only files that end with .jpg.

       To select your image from the X server screen instead of from  a  file,
       Choose Grab of the Open widget.

VISUAL IMAGE DIRECTORY

       To create a Visual Image Directory, choose Visual Directory of the File
       sub-menu from the Command widget . A  file  browser  is  displayed.  To
       create  a  Visual  Image  Directory  from all the images in the current
       directory, press Directory or press the RETURN key.  Alternatively, you
       can select a set of image names by using shell globbing characters. For
       example, type *.jpg to include  only  files  that  end  with  .jpg.  To
       descend directories, choose a directory name and press the button twice
       quickly. A scrollbar allows a large  list  of  filenames  to  be  moved
       through the viewing area if it exceeds the size of the list area.

       After  you  select  a set of files, they are turned into thumbnails and
       tiled onto a single  image.  Now  move  the  pointer  to  a  particular
       thumbnail  and press button 3 and drag. Finally, select Open. The image
       represented by the thumbnail is displayed at its full size. Choose Next
       from  the  File  sub-menu of the Command widget to return to the Visual
       Image Directory.

IMAGE CUTTING

       Note that  cut  information  for  image  window  is  not  retained  for
       colormapped X server visuals (e.g. StaticColor, StaticColor, GRAYScale,
       PseudoColor).  Correct cutting behavior  may  require  a  TrueColor  or
       DirectColor visual or a Standard Colormap.

       To  begin,  press  choose  Cut  of  the  Edit sub-menu from the Command
       widget. Alternatively, press F3 in the image window.

       A small window appears showing the location of the cursor in the  image
       window.  You  are  now in cut mode. In cut mode, the Command widget has
       these options:

           Help
           Dismiss

       To define a cut region, press button 1 and  drag.  The  cut  region  is
       defined  by  a  highlighted  rectangle  that expands or contracts as it
       follows the pointer. Once  you  are  satisfied  with  the  cut  region,
       release  the button.  You are now in rectify mode. In rectify mode, the
       Command widget has these options:

           Cut
           Help
           Dismiss

       You can make adjustments by moving  the  pointer  to  one  of  the  cut
       rectangle  corners, pressing a button, and dragging. Finally, press Cut
       to commit your copy region. To exit without cutting  the  image,  press
       Dismiss.

IMAGE COPYING

       To  begin,  press  choose  Copy  of  the Edit sub-menu from the Command
       widget. Alternatively, press F4 in the image window.

       A small window appears showing the location of the cursor in the  image
       window.  You are now in copy mode. In copy mode, the Command widget has
       these options:

           Help
           Dismiss

       To define a copy region, press button 1 and drag. The  copy  region  is
       defined  by  a  highlighted  rectangle  that expands or contracts as it
       follows the pointer. Once you  are  satisfied  with  the  copy  region,
       release  the button.  You are now in rectify mode. In rectify mode, the
       Command widget has these options:

           Copy
           Help
           Dismiss

       You can make adjustments by moving the  pointer  to  one  of  the  copy
       rectangle corners, pressing a button, and dragging. Finally, press Copy
       to commit your copy region. To exit without copying  the  image,  press
       Dismiss.

IMAGE PASTING

       To  begin,  press  choose  Paste  of the Edit sub-menu from the Command
       widget. Alternatively, press F5 in the image window.

       A small window appears showing the location of the cursor in the  image
       window.  You are now in Paste mode. To exit immediately, press Dismiss.
       In Paste mode, the Command widget has these options:

           Operators

           over
           in
           out
           atop
           xor
           plus
           minus
           add
           subtract
           difference
           multiply
           bumpmap
           replace

           Help
           Dismiss

       Choose a composite operation from the Operators sub-menu of the Command
       widget.  How  each operator behaves is described below. image window is
       the image currently displayed on your X server and image is  the  image
       obtained with the File Browser widget.

       over     The  result  is  the union of the two image shapes, with image
              obscuring image window in the region of overlap.

       in      The result is simply image cut by the shape  of  image  window.
              None of the image data of image window is in the result.

       out     The resulting image is image with the shape of image window cut
              out.

       atop    The result is the  same  shape  as  image  window,  with  image
              obscuring image window where the image shapes overlap. Note this
              differs from over because the portion  of  image  outside  image
              window's shape does not appear in the result.

       xor      The  result is the image data from both image and image window
              that is outside the overlap region. The overlap region is blank.

       plus    The result is just the sum of the image data. Output values are
              cropped  to  the  maximum value (no overflow). This operation is
              independent of the matte channels.

       minus   The result of image - image window, with underflow  cropped  to
              zero.  The  matte  channel  is  ignored  (set  to  opaque,  full
              coverage).

       add     The result of image +  image  window,  with  overflow  wrapping
              around (mod MaxRGB+1).

       subtract
                The  result  of  image - image window, with underflow wrapping
              around (mod MaxRGB+1). The add and  subtract  operators  can  be
              used to perform reversible transformations.

       difference
                The  result  of  abs(image - image window). This is useful for
              comparing two very similar images.

       multiply
               The result of image * image window.  This  is  useful  for  the
              creation of drop-shadows.

       bumpmap
               The result of image window shaded by window.

       replace
              The  resulting  image is image window replaced with image.  Here
              the matte information is ignored.

              The image compositor requires a matte, or alpha channel  in  the
              image  for some operations. This extra channel usually defines a
              mask which represents a sort of a cookie-cutter for  the  image.
              This  is  the  case when matte is 255 (full coverage) for pixels
              inside the shape, zero outside, and between zero and 255 on  the
              boundary.  If  image  does  not  have  a  matte  channel,  it is
              initialized with 0 for any pixel  matching  in  color  to  pixel
              location (0,0), otherwise 255. See Matte Editing for a method of
              defining a matte channel.

              Note that matte information for image window is not retained for
              colormapped  X  server  visuals  (e.g. StaticColor, StaticColor,
              GrayScale,  PseudoColor).   Correct  compositing  behavior   may
              require   a  TrueColor  or  DirectColor  visual  or  a  Standard
              Colormap.

              Choosing a composite operator is optional. The default  operator
              is  replace.   However,  you must choose a location to composite
              your image and press button 1. Press and hold the button  before
              releasing  and  an  outline of the image will appear to help you
              identify your location.

              The actual colors of the pasted image  is  saved.  However,  the
              color  that  appears  in  image  window  may  be  different. For
              example, on a monochrome screen image window will  appear  black
              or  white even though your pasted image may have many colors. If
              the image is saved to a file it  is  written  with  the  correct
              colors.  To  assure  the  correct  colors are saved in the final
              image, any PseudoClass image is  promoted  to  DirectClass.   To
              force a PseudoClass image to remain PseudoClass, use -colors.

IMAGE CROPPING

       To  begin,  press choose Crop of the Transform submenu from the Command
       widget. Alternatively, press C in the image window.

       A small window appears showing the location of the cursor in the  image
       window.  You are now in crop mode. In crop mode, the Command widget has
       these options:

           Help
           Dismiss

       To define a cropping region, press button  1  and  drag.  The  cropping
       region  is defined by a highlighted rectangle that expands or contracts
       as it follows the pointer. Once you are  satisfied  with  the  cropping
       region,  release  the  button.  You are now in rectify mode. In rectify
       mode, the Command widget has these options:

           Crop
           Help
           Dismiss

       You can make adjustments by moving the pointer to one of  the  cropping
       rectangle corners, pressing a button, and dragging. Finally, press Crop
       to commit your cropping region. To exit  without  cropping  the  image,
       press Dismiss.

IMAGE CHOPPING

       An image is chopped interactively. There is no command line argument to
       chop an image. To begin, choose Chop of the Transform sub-menu from the
       Command widget. Alternatively, press [ in the Image window.

       You  are now in Chop mode. To exit immediately, press Dismiss.  In Chop
       mode, the Command widget has these options:

           Direction

           horizontal
           vertical

           Help
           Dismiss

       If the you choose the horizontal direction (this is the  default),  the
       area of the image between the two horizontal endpoints of the chop line
       is removed.  Otherwise, the area of the image between the two  vertical
       endpoints of the chop line is removed.

       Select a location within the image window to begin your chop, press and
       hold any button. Next, move the pointer  to  another  location  in  the
       image.   As  you  move a line will connect the initial location and the
       pointer. When you release the button, the area within the image to chop
       is determined by which direction you choose from the Command widget.

       To  cancel  the  image  chopping, move the pointer back to the starting
       point of the line and release the button.

IMAGE ROTATION

       Press the / key to rotate the image 90  degrees  or  \  to  rotate  -90
       degrees.   To  interactively  choose  the  degree  of  rotation, choose
       Rotate...   of  the  Transform  submenu  from   the   Command   Widget.
       Alternatively, press * in the image window.

       A  small  horizontal  line is drawn next to the pointer. You are now in
       rotate mode. To exit immediately, press Dismiss. In  rotate  mode,  the
       Command widget has these options:

           Pixel Color

           black
           blue
           cyan
           green
           gray
           red
           magenta
           yellow
           white
           Browser...

           Direction

           horizontal
           vertical

           Help
           Dismiss

       Choose  a  background  color  from the Pixel Color sub-menu. Additional
       background colors can be specified with  the  color  browser.  You  can
       change the menu colors by setting the X resources pen1 through pen9.

       If  you  choose  the  color  browser and press Grab, you can select the
       background color by moving the pointer to  the  desired  color  on  the
       screen and press any button.

       Choose  a  point  in  the  image window and press this button and hold.
       Next, move the pointer to another location in the image. As you move  a
       line  connects  the  initial location and the pointer. When you release
       the button, the degree of image rotation is determined by the slope  of
       the  line  you  just  drew.  The slope is relative to the direction you
       choose from the Direction sub-menu of the Command widget.

       To cancel the image rotation, move the pointer  back  to  the  starting
       point of the line and release the button.

IMAGE ANNOTATION

       An  image is annotated interactively. There is no command line argument
       to annotate an image. To begin, choose Annotate of the Image Edit  sub-
       menu  from  the  Command  widget.  Alternatively,  press a in the image
       window.

       A small window appears showing the location of the cursor in the  image
       window.  You  are  now  in  annotate  mode.  To exit immediately, press
       Dismiss.  In annotate mode, the Command widget has these options:

       Font Name

       fixed

       variable

       5x8

       6x10

       7x13bold

       8x13bold

       9x15bold

       10x20

       12x24

       Browser...

       Font Color

       black

       blue

       cyan

       green

       gray

       red

       magenta

       yellow

       white

       transparent

       Browser...

       Box Color

       black

       blue

       cyan

       green

       gray

       red

       magenta

       yellow

       white

       transparent

       Browser...

       Rotate Text

       -90

       -45

       -30

       0

       30

       45

       90

       180

       Dialog...

       Help

       Dismiss

       Choose a font name from the Font Name sub-menu. Additional  font  names
       can  be  specified with the font browser. You can change the menu names
       by setting the X resources font1 through font9.

       Choose a font color from  the  Font  Color  sub-menu.  Additional  font
       colors can be specified with the color browser. You can change the menu
       colors by setting the X resources pen1 through pen9.

       If you select the color browser and press Grab, you can choose the font
       color  by  moving  the  pointer  to the desired color on the screen and
       press any button.

       If you choose to rotate the text, choose Rotate Text from the menu  and
       select  an  angle.  Typically  you will only want to rotate one line of
       text at a time. Depending on the angle you choose, subsequent lines may
       end up overwriting each other.

       Choosing  a  font  and its color is optional. The default font is fixed
       and the default color is black. However, you must choose a location  to
       begin  entering  text  and press a button. An underscore character will
       appear at the location of the pointer. The cursor changes to  a  pencil
       to indicate you are in text mode. To exit immediately, press Dismiss.

       In  text  mode,  any  key  presses  will  display  the character at the
       location of the underscore and advance  the  underscore  cursor.  Enter
       your  text  and  once  completed  press  Apply  to  finish  your  image
       annotation. To correct errors press BACK SPACE.  To  delete  an  entire
       line  of  text,  press DELETE.  Any text that exceeds the boundaries of
       the image window is automatically continued onto the next line.

       The actual color you request for  the  font  is  saved  in  the  image.
       However,  the color that appears in your Image window may be different.
       For example, on a monochrome screen the text will appear black or white
       even  if you choose the color red as the font color. However, the image
       saved to a file with -write is written with red  lettering.  To  assure
       the  correct  color  text  in the final image, any PseudoClass image is
       promoted to DirectClass (see miff(5)). To force a PseudoClass image  to
       remain PseudoClass, use -colors.

IMAGE COMPOSITING

       An  image  composite is created interactively. There is no command line
       argument to composite an image. To begin, choose Composite of the Image
       Edit  from  the  Command  widget.  Alternatively,  press x in the Image
       window.

       First a popup window is displayed requesting  you  to  enter  an  image
       name.   Press  Composite, Grab or type a file name. Press Cancel if you
       choose not to create a composite image. When you choose Grab, move  the
       pointer to the desired window and press any button.

       If  the  Composite  image  does not have any matte information, you are
       informed and the file browser is displayed again. Enter the name  of  a
       mask  image.  The image is typically grayscale and the same size as the
       composite image. If the image is not  grayscale,  it  is  converted  to
       grayscale and the resulting intensities are used as matte information.

       A  small window appears showing the location of the cursor in the image
       window. You are now in  composite  mode.  To  exit  immediately,  press
       Dismiss.  In composite mode, the Command widget has these options:

       Operators

       over

       in

       out

       atop

       xor

       plus

       minus

       add

       subtract

       difference

       bumpmap

       replace

       Blend

       Displace

       Help

       Dismiss

       Choose a composite operation from the Operators sub-menu of the Command
       widget. How each operator behaves is described below. image  window  is
       the  image  currently displayed on your X server and image is the image
       obtained

       over    The result is the union of the two  image  shapes,  with  image
              obscuring image window in the region of overlap.

       in       The  result  is simply image cut by the shape of image window.
              None of the image data of image window is in the result.

       out     The resulting image is image with the shape of image window cut
              out.

       atop     The  result  is  the  same  shape  as image window, with image
              obscuring image window where the image shapes overlap. Note this
              differs  from  over  because  the portion of image outside image
              window's shape does not appear in the result.

       xor     The result is the image data from both image and  image  window
              that is outside the overlap region. The overlap region is blank.

       plus    The result is just the sum of the image data. Output values are
              cropped to 255 (no overflow). This operation is  independent  of
              the matte channels.

       minus    The  result of image - image window, with underflow cropped to
              zero. The matte channel is ignored (set to 255, full coverage).

       add     The result of image +  image  window,  with  overflow  wrapping
              around (mod 256).

       subtract
                The  result  of  image - image window, with underflow wrapping
              around (mod 256). The add and subtract operators can be used  to
              perform reversible transformations.

       difference
                The  result  of  abs(image - image window). This is useful for
              comparing two very similar images.

       bumpmap
               The result of image window shaded by window.

       replace
               The resulting image is image window replaced with image.   Here
              the matte information is ignored.

              The  image  compositor requires a matte, or alpha channel in the
              image for some operations. This extra channel usually defines  a
              mask  which  represents a sort of a cookie-cutter for the image.
              This is the case when matte is 255 (full  coverage)  for  pixels
              inside  the shape, zero outside, and between zero and 255 on the
              boundary. If  image  does  not  have  a  matte  channel,  it  is
              initialized  with  0  for  any  pixel matching in color to pixel
              location (0,0), otherwise 255. See Matte Editing for a method of
              defining a matte channel.

              If  you  choose blend, the composite operator becomes over.  The
              image matte  channel  percent  transparency  is  initialized  to
              factor.   The image window is initialized to (100-factor). Where
              factor is the value you specify in the Dialog widget.

              Displace shifts the image pixels as defined  by  a  displacement
              map.   With  this  option,  image is used as a displacement map.
              Black, within  the  displacement  map,  is  a  maximum  positive
              displacement.  White  is  a  maximum  negative  displacement and
              middle gray is neutral. The displacement is scaled to  determine
              the  pixel  shift.  By default, the displacement applies in both
              the horizontal and vertical directions. However, if you  specify
              mask,  image  is  the  horizontal  X  displacement  and mask the
              vertical Y displacement.

              Note that matte information for image window is not retained for
              colormapped  X  server  visuals (e.g.  StaticColor, StaticColor,
              GrayScale,  PseudoColor).   Correct  compositing  behavior   may
              require   a  TrueColor  or  DirectColor  visual  or  a  Standard
              Colormap.

              Choosing a composite operator is optional. The default  operator
              is  replace.   However,  you must choose a location to composite
              your image and press button 1. Press and hold the button  before
              releasing  and  an  outline of the image will appear to help you
              identify your location.

              The actual colors of the composite image is saved. However,  the
              color  that  appears  in  image  window  may  be  different. For
              example, on a monochrome screen Image window will  appear  black
              or white even though your composited image may have many colors.
              If the image is saved to a file it is written with  the  correct
              colors.  To  assure  the  correct  colors are saved in the final
              image, any PseudoClass image is  promoted  to  DirectClass  (see
              miff).   To force a PseudoClass image to remain PseudoClass, use
              -colors.

COLOR EDITING

       Changing the the color of a set of pixels is  performed  interactively.
       There  is  no  command  line argument to edit a pixel. To begin, choose
       Color  from  the  Image   Edit   submenu   of   the   Command   widget.
       Alternatively, press c in the image window.

       A  small window appears showing the location of the cursor in the image
       window. You are now in color edit  mode.  To  exit  immediately,  press
       Dismiss.  In color edit mode, the Command widget has these options:

       Method

       point

       replace

       floodfill

       reset

       Pixel Color

       black

       blue

       cyan

       green

       gray

       red

       magenta

       yellow

       white

       Browser...

       Border Color

       black

       blue

       cyan

       green

       gray

       red

       magenta

       yellow

       white

       Browser...

       Fuzz

       0

       2

       4

       8

       16
           Dialog...

       Undo

       Help

       Dismiss

       Choose  a  color editing method from the Method sub-menu of the Command
       widget. The point method recolors any pixel selected with  the  pointer
       unless  the  button  is released. The replace method recolors any pixel
       that matches the color of the pixel you select  with  a  button  press.
       Floodfill  recolors  any  pixel that matches the color of the pixel you
       select with a button press and is  a  neighbor.   Whereas  filltoborder
       changes  the  matte  value of any neighbor pixel that is not the border
       color.  Finally reset changes the entire image to the designated color.

       Next, choose a pixel color from the Pixel  Color  sub-menu.  Additional
       pixel  colors  can  be specified with the color browser. You can change
       the menu colors by setting the X resources pen1 through pen9.

       Now press button 1 to select a pixel within the Image window to  change
       its  color.  Additional  pixels  may  be recolored as prescribed by the
       method you choose. additional pixels by increasing the Delta value.

       If the Magnify widget is mapped, it can be helpful in positioning  your
       pointer  within  the  image  (refer to button 2). Alternatively you can
       select a pixel to recolor from within  the  Magnify  widget.  Move  the
       pointer  to  the  Magnify widget and position the pixel with the cursor
       control keys. Finally, press a button to recolor the selected pixel (or
       pixels).

       The  actual  color  you  request  for the pixels is saved in the image.
       However, the color that appears in your Image window may be  different.
       For  example,  on  a  monochrome  screen the pixel will appear black or
       white even if you choose the color red as the pixel color. However, the
       image saved to a file with -write is written with red pixels. To assure
       the correct color text in the final image,  any  PseudoClass  image  is
       promoted  to  DirectClass  To  force  a  PseudoClass  image  to  remain
       PseudoClass, use -colors.

MATTE EDITING

       Matte information within an image is useful for some operations such as
       image  compositing.  This  extra  channel  usually defines a mask which
       represents a sort of a cookie-cutter for the image. This  is  the  case
       when  matte  is  255  (full coverage) for pixels inside the shape, zero
       outside, and between zero and 255 on the boundary.

       Setting the matte information in an image is done interactively.  There
       is no command line argument to edit a pixel. To begin, and choose Matte
       of the Image Edit sub-menu from the Command widget.

       Alternatively, press m in the image window.

       A small window appears showing the location of the cursor in the  image
       window.  You  are  now  in  matte edit mode. To exit immediately, press
       Dismiss.  In matte edit mode, the Command widget has these options:

       Method

       point

       replace

       floodfill

       reset

       Border Color

       black

       blue

       cyan

       green

       gray

       red

       magenta

       yellow

       white

       Browser...

       Fuzz

       0

       2

       4

       8

       16
           Dialog...

       Matte

       Undo

       Help

       Dismiss

       Choose a matte editing method from the Method sub-menu of  the  Command
       widget.  The  point  method  changes  the  matte value of the any pixel
       selected with the pointer until the button  is  released.  The  replace
       method  changes  the matte value of any pixel that matches the color of
       the pixel you select with a button press. Floodfill changes  the  matte
       value  of any pixel that matches the color of the pixel you select with
       a button press and is a neighbor.  Whereas  filltoborder  recolors  any
       neighbor  pixel that is not the border color. Finally reset changes the
       entire image to the designated matte value.  Choose Matte Value  and  a
       dialog  appears  requesting a matte value.  Enter a value between 0 and
       255. This value is assigned as the matte value of the selected pixel or
       pixels.   Now,  press  any  button  to  select a pixel within the Image
       window to change its matte value. You can change  the  matte  value  of
       additional  pixels  by  increasing  the Delta value. The Delta value is
       first added then subtracted from the red, green, and blue of the target
       color. Any pixels within the range also have their matte value updated.
       If the Magnify widget is mapped, it can be helpful in positioning  your
       pointer  within  the  image  (refer to button 2). Alternatively you can
       select a pixel to change  the  matte  value  from  within  the  Magnify
       widget.   Move the pointer to the Magnify widget and position the pixel
       with the cursor control keys. Finally, press a  button  to  change  the
       matte  value  of  the selected pixel (or pixels).  Matte information is
       only valid in a DirectClass image. Therefore, any PseudoClass image  is
       promoted to DirectClass. Note that matte information for PseudoClass is
       not retained  for  colormapped  X  server  visuals  (e.g.  StaticColor,
       StaticColor,  GrayScale,  PseudoColor) unless you immediately save your
       image to a file (refer to Write). Correct matte  editing  behavior  may
       require a TrueColor or DirectColor visual or a Standard Colormap.

IMAGE DRAWING

       An image is drawn upon interactively. There is no command line argument
       to draw on an image. To begin, choose Draw of the Image  Edit  sub-menu
       from the Command widget.  Alternatively, press d in the image window.

       The  cursor changes to a crosshair to indicate you are in draw mode. To
       exit immediately, press Dismiss. In draw mode, the Command  widget  has
       these options:

       Primitive

       point

       line

       rectangle

       fill rectangle

       circle

       fill circle

       ellipse

       fill ellipse

       polygon

       fill polygon

       Color

       black

       blue

       cyan

       green

       gray

       red

       magenta

       yellow

       white

       transparent

       Browser...

       Stipple

       Brick

       Diagonal

       Scales

       Vertical

       Wavy

       Translucent

       Opaque

       Open...

       Width

       1

       2

       4

       8

       16
           Dialog...

       Undo

       Help

       Dismiss

       Choose a drawing primitive from the Primitive sub-menu.

       Next,  choose a color from the Color sub-menu. Additional colors can be
       specified with the color browser. You can change  the  menu  colors  by
       setting  the  X  resources  pen1  through  pen9.  The transparent color
       updates the image matte channel and is useful for image compositing.

       If you choose the color browser and press  Grab,  you  can  select  the
       primitive  color  by  moving  the  pointer  to the desired color on the
       screen and press any button. The transparent color  updates  the  image
       matte channel and is useful for image compositing.

       Choose a stipple, if appropriate, from the Stipple sub-menu. Additional
       stipples can be specified with the file browser. Stipples obtained from
       the file browser must be on disk in the X11 bitmap format.

       Choose a line width, if appropriate, from the Width sub-menu. To choose
       a specific width select the Dialog widget.

       Choose a point in the image window and press button 1 and  hold.  Next,
       move  the pointer to another location in the image. As you move, a line
       connects the initial location and the pointer.  When  you  release  the
       button,  the  image  is  updated  with the primitive you just drew. For
       polygons, the image is updated when you press and  release  the  button
       without moving the pointer.

       To cancel image drawing, move the pointer back to the starting point of
       the line and release the button.

REGION OF INTEREST

       To begin, press choose Region of Interest of the Pixel  Transform  sub-
       menu  from  the  Command  widget.   Alternatively, press R in the image
       window.

       A small window appears showing the location of the cursor in the  image
       window.  You  are now in region of interest mode. In region of interest
       mode, the Command widget has these options:

       Help

       Dismiss

       To define a region of interest, press button 1 and drag. The region  of
       interest  is  defined  by  a  highlighted  rectangle  that  expands  or
       contracts as it follows the pointer. Once you are  satisfied  with  the
       region  of  interest, release the button. You are now in apply mode. In
       apply mode the Command widget has these options:

       File

       Save...

       Print...

       Edit

       Undo

       Redo

       Transform

       Flip

       Flop

       Rotate Right

       Rotate Left

       Enhance

       Hue...

       Saturation...

       Brightness...

       Gamma...

       Spiff

       Dull

       Equalize

       Normalize

       Negate

       GRAYscale

       Quantize...

       Effects

       Despeckle

       Emboss

       Reduce Noise

       Add Noise

       Sharpen...

       Blur...

       Threshold...

       Edge Detect...

       Spread...

       Shade...

       Raise...

       Segment...

       F/X

       Solarize...

       Swirl...

       Implode...

       Wave...

       Oil Paint

       Charcoal Draw...

       Miscellany

       Image Info

       Zoom Image

       Show Preview...

       Show Histogram

       Show Matte

       Help

       Dismiss

       You can make adjustments to  the  region  of  interest  by  moving  the
       pointer  to  one  of  the  rectangle  corners,  pressing  a button, and
       dragging. Finally,  choose  an  image  processing  technique  from  the
       Command widget. You can choose more than one image processing technique
       to apply to an area. Alternatively, you can move the region of interest
       before  applying  another  image  processing  technique. To exit, press
       Dismiss.

IMAGE PANNING

       When an image exceeds the width or  height  of  the  X  server  screen,
       display  maps  a  small  panning icon. The rectangle within the panning
       icon shows the area that  is  currently  displayed  in  the  the  image
       window.  To  pan about the image, press any button and drag the pointer
       within the panning icon.  The pan rectangle moves with the pointer  and
       the  image  window  is updated to reflect the location of the rectangle
       within the panning icon. When you have selected the area of  the  image
       you wish to view, release the button.

       Use  the arrow keys to pan the image one pixel up, down, left, or right
       within the image window.

       The panning icon is withdrawn if the image  becomes  smaller  than  the
       dimensions of the X server screen.

USER PREFERENCES

       Preferences  affect the default behavior of display(1). The preferences
       are either true or false and are  stored  in  your  home  directory  as
       .displayrc:

                display image centered on a backdrop"

                    This  backdrop covers the entire workstation screen and is
                    useful for hiding other X window  activity  while  viewing
                    the  image.  The color of the backdrop is specified as the
                    background color. Refer to X Resources for details.
                confirm on program exit"

                    Ask for  a  confirmation  before  exiting  the  display(1)
                    program.
                correct image for display gamma"

                    If  the image has a known gamma, the gamma is corrected to
                    match  that  of  the  X  server  (see   the   X   Resource
                    displayGamma).
                display warning messages"

                    Display any warning messages.
                apply Floyd/Steinberg error diffusion to image"

                    The  basic  strategy  of  dithering  is to trade intensity
                    resolution  for  spatial  resolution  by   averaging   the
                    intensities  of  several neighboring pixels.  Images which
                    suffer from severe contouring when reducing colors can  be
                    improved with this preference.
                use a shared colormap for colormapped X visuals"

                    This  option only applies when the default X server visual
                    is PseudoColor or GRAYScale. Refer  to  -visual  for  more
                    details.  By  default, a shared colormap is allocated. The
                    image shares colors with  other  X  clients.   Some  image
                    colors  could  be  approximated,  therefore your image may
                    look very different than  intended.  Otherwise  the  image
                    colors  appear exactly as they are defined. However, other
                    clients may go technicolor  when  the  image  colormap  is
                    installed.
                display images as an X server pixmap"

                    Images  are  maintained  as  a XImage by default. Set this
                    resource to True to utilize a server Pixmap instead.  This
                    option  is  useful if your image exceeds the dimensions of
                    your server screen  and  you  intend  to  pan  the  image.
                    Panning  is  much  faster with Pixmaps than with a XImage.
                    Pixmaps are considered a precious resource, use them  with
                    discretion.

GM IDENTIFY

       Identify  describes the format and characteristics of one or more image
       files. It will also report if an image is incomplete or  corrupt.   The
       information  displayed  includes  the  scene number, the file name, the
       width and height of the image, whether the image is colormapped or not,
       the  number  of  colors in the image, the number of bytes in the image,
       the format of the image (JPEG, PNM, etc.), and finally  the  number  of
       seconds  in both user time and elapsed time it took to read and process
       the image.  If -verbose or +ping are provided as an option,  the  pixel
       read  rate  is  also  displayed.  An  example line output from identify
       follows:

           images/aquarium.miff 640x480 PseudoClass 256c
                  308135b MIFF 0.000u 0:01

       If -verbose is  set,  expect  additional  output  including  any  image
       comment:

           Image: images/aquarium.miff
           class: PseudoClass
           colors: 256
           signature: eb5dca81dd93ae7e6ffae99a527eb5dca8...
           matte: False
           geometry: 640x480
              depth: 8
           bytes: 308135
           format: MIFF
           comments:
           Imported from MTV raster image: aquarium.mtv

       For some formats, additional format-specific information about the file
       will be written if the -debug coder or -debug all option is used.

IDENTIFY OPTIONS

       Options are processed in command line order. Any option you specify  on
       the  command  line  remains in effect for the set of images immediately
       following, until the set is terminated by the appearance of any  option
       or -noop.

       For a more detailed description of each option, see Options, above.

       -authenticate <string>
              decrypt image with this password

       -debug <events>
              enable debug printout

       -define <key>{=<value>},...
              add coder/decoder specific options

       -density <width>x<height>
              horizontal and vertical resolution in pixels of the image

       -depth <value>
              depth of the image

       -format <string>
              output formatted image characteristics

       -help  print usage instructions

       -interlace <type>
              the type of interlacing scheme

       -limit <type> <value>
              Disk, File, Map, Memory, Pixels, or Threads resource limit

       -log <string>
              Specify format for debug log

       -ping  efficiently determine image characteristics

       -sampling-factor <horizontal_factor>x<vertical_factor>
              chroma subsampling factors

       -size <width>x<height>{+offset}
              width and height of the image

       -verbose
              print detailed information about the image

       -version
              print GraphicsMagick version string

              For  a  more  detailed  description of each option, see Options,
              above.

GM IMPORT

       Import reads an image from any  visible  window  on  an  X  server  and
       outputs  it  as  an  image  file.  You can capture a single window, the
       entire screen, or any rectangular portion of the screen.   Use  display
       for   redisplay,   printing,   editing,  formatting,  archiving,  image
       processing, etc. of the captured image.

       The target window can be specified by id, name, or may be  selected  by
       clicking  the  mouse  in  the desired window. If you press a button and
       then drag, a rectangle will form which expands  and  contracts  as  the
       mouse  moves.  To  save  the  portion  of  the  screen  defined  by the
       rectangle, just release the button. The keyboard bell is rung  once  at
       the beginning of the screen capture and twice when it completes.

EXAMPLES

       To  select an X window or an area of the screen with the mouse and save
       it in the MIFF image format to a file entitled window.miff, use:

           gm import window.miff

       To select an X window or an area of the screen with the mouse and  save
       it  in  the  Encapsulated  PostScript  format  to  include  in  another
       document, use:

           gm import figure.eps

       To capture the entire X server screen in the JPEG  image  format  in  a
       file entitled root.jpeg, without using the mouse, use:

           gm import -window root root.jpeg

       To  capture  the 512x256 area at the upper right corner of the X server
       screen in the PNG image  format  in  a  well-compressed  file  entitled
       corner.png, without using the mouse,  use:

           gm import -window root -crop 512x256-0+0 -quality 90
                  corner.png

OPTIONS

       Options  are processed in command line order. Any option you specify on
       the command line remains in effect until it is  explicitly  changed  by
       specifying the option again with a different effect.

       Import  options  can  appear on the command line or in your X resources
       file. See X(1). Options on the command line supersede values  specified
       in your X resources file.

       For a more detailed description of each option, see Options, above.

       -bordercolor <color>
              the border color

       -colors <value>
              preferred number of colors in the image

       -colorspace <value>
              the type of colorspace

       -comment <string>
              annotate an image with a comment

       -crop <width>x<height>{+-}<x>{+-}<y>{%}
              preferred size and location of the cropped image

       -debug <events>
              enable debug printout

       -define <key>{=<value>},...
              add coder/decoder specific options

       -delay <1/100ths of a second>
              display the next image after pausing

       -density <width>x<height>
              horizontal and vertical resolution in pixels of the image

       -depth <value>
              depth of the image

       -descend
              obtain image by descending window hierarchy

       -display <host:display[.screen]>
              specifies the X server to contact

       -dispose <method>
              GIF disposal method

       -dither
              apply Floyd/Steinberg error diffusion to the image

       -encoding <type>
              specify the text encoding

       -endian <type>
              specify endianness (MSB, LSB, or Native) of image

       -frame include the X window frame in the imported image

       -geometry <width>x<height>{+-}<x>{+-}<y>{%}{@}{!}{^}{<}{>}
              preferred size and location of the Image window.

       -help  print usage instructions

       -interlace <type>
              the type of interlacing scheme

       -label <name>
              assign a label to an image

       -limit <type> <value>
              Disk, File, Map, Memory, Pixels, or Threads resource limit

       -log <string>
              Specify format for debug log

       -monitor
              show progress indication

       -monochrome
              transform the image to black and white

       -negate
              replace every pixel with its complementary color

       -page <width>x<height>{+-}<x>{+-}<y>{%}{!}{<}{>}
              size and location of an image canvas

       -pause <seconds>
              pause between snapshots [import]

       -ping  efficiently determine image characteristics

       -pointsize <value>
              pointsize of the PostScript, X11, or TrueType font

       -quality <value>
              JPEG/MIFF/PNG/TIFF compression level

       -resize <width>x<height>{%}{@}{!}{<}{>}
              resize an image

       -rotate <degrees>{<}{>}
              rotate the image

       -sampling-factor <horizontal_factor>x<vertical_factor>
              chroma subsampling factors

       -scene <value>
              set scene number

       -screen
              specify the screen to capture

       -set <attribute> <value>
              set an image attribut

       -silent
              operate silently

       -snaps <value>
              number of screen snapshots

       -thumbnail <width>x<height>{%}{@}{!}{<}{>}
              resize an image (quickly)

       -transparent <color>
              make this color transparent within the image

       -trim  trim an image

       -verbose
              print detailed information about the image

       -version
              print GraphicsMagick version string

              For  a  more  detailed  description of each option, see Options,
              above.

GM MOGRIFY

       Mogrify transforms an image or a sequence of images.  These  transforms
       include  image  scaling,  image  rotation, color reduction, and others.
       Each transmogrified image overwrites the corresponding original  image,
       unless  an  option  such  as  -format  causes the output filename to be
       different from the input filename.

       The   graphics   formats   supported   by   mogrify   are   listed   in
       GraphicsMagick(1).

EXAMPLES

       To convert all the TIFF files in a particular directory to JPEG, use:

           gm mogrify -format jpeg *.tiff

       To convert a directory full of JPEG images to thumbnails, use:

           gm mogrify -size 120x120 *.jpg -resize 120x120 +profile "*"

       In  this example, '-size 120x120' gives a hint to the JPEG decoder that
       the images are going to be downscaled to 120x120, allowing  it  to  run
       faster  by  avoiding returning full-resolution images to GraphicsMagick
       for the subsequent resizing operation.  The ´-resize 120x120' specifies
       the  desired dimensions of the output images.  It will be scaled so its
       largest dimension is 120 pixels.  The ´+profile "*"' removes  any  ICM,
       EXIF,  IPTC,  or  other profiles that might be present in the input and
       aren't needed in the thumbnails.

       To scale an image of a cockatoo to exactly 640 pixels in width and  480
       pixels in height, use:

           gm mogrify -resize 640x480! cockatoo.miff

OPTIONS

       Options  are processed in command line order. Any option you specify on
       the command line remains in effect for the set of images that  follows,
       until the set is terminated by the appearance of any option or -noop.

       For a more detailed description of each option, see Options, above.

       -affine <matrix>
              drawing transform matrix

       -antialias
              remove pixel aliasing

        -asc-cdl <spec>
              apply ASC CDL color transform

       -authenticate <string>
              decrypt image with this password

       -background <color>
              the background color

       -black-threshold red[,green][,blue][,opacity]
              pixels below the threshold become black

       -blue-primary <x>,<y>
              blue chromaticity primary point

       -blur <radius>{x<sigma>}
              blur the image with a Gaussian operator

       -border <width>x<height>
              surround the image with a border of color

       -bordercolor <color>
              the border color

       -channel <type>
              the type of channel

       -charcoal <factor>
              simulate a charcoal drawing

       -colorize <value>
              colorize the image with the pen color

       -colors <value>
              preferred number of colors in the image

       -colorspace <value>
              the type of colorspace

       -comment <string>
              annotate an image with a comment

       -compose <operator>
              the type of image composition

       -compress <type>
              the type of image compression

       -contrast
              enhance or reduce the image contrast

       -convolve <kernel>
              convolve image with the specified convolution kernel

       -create-directories
              create output directory if required

       -crop <width>x<height>{+-}<x>{+-}<y>{%}
              preferred size and location of the cropped image

       -cycle <amount>
              displace image colormap by amount

       -debug <events>
              enable debug printout

       -define <key>{=<value>},...
              add coder/decoder specific options

       -delay <1/100ths of a second>
              display the next image after pausing

       -density <width>x<height>
              horizontal and vertical resolution in pixels of the image

       -depth <value>
              depth of the image

       -despeckle
              reduce the speckles within an image

       -display <host:display[.screen]>
              specifies the X server to contact

       -dispose <method>
              GIF disposal method

       -dither
              apply Floyd/Steinberg error diffusion to the image

       -draw <string>
              annotate an image with one or more graphic primitives

       -edge <radius>
              detect edges within an image

       -emboss <radius>
              emboss an image

       -encoding <type>
              specify the text encoding

       -endian <type>
              specify endianness (MSB, LSB, or Native) of image

       -enhance
              apply a digital filter to enhance a noisy image

       -equalize
              perform histogram equalization to the image

       -extent <width>x<height>{+-}<x>{+-}<y>
              composite image on background color canvas image

       -fill <color>
              color to use when filling a graphic primitive

       -filter <type>
              use this type of filter when resizing an image

       -flip  create a "mirror image"

       -flop  create a "mirror image"

       -font <name>
              use this font when annotating the image with text

       -format <type>
              the image format type

       -frame <width>x<height>+<outer bevel width>+<inner bevel width>
              surround the image with an ornamental border

       -fuzz <distance>{%}
              colors within this Euclidean distance are considered equal

       -gamma <value>
              level of gamma correction

       -gaussian <radius>{x<sigma>}
              blur the image with a Gaussian operator

       -geometry <width>x<height>{+-}<x>{+-}<y>{%}{@}{!}{^}{<}{>}
              preferred size and location of the Image window.

       -gravity <type>
              direction primitive  gravitates to when annotating the image.

       -green-primary <x>,<y>
              green chromaticity primary point

       -hald-clut <clut>
              apply a Hald CLUT to the image

       -help  print usage instructions

       -implode <factor>
              implode image pixels about the center

       -interlace <type>
              the type of interlacing scheme

       -label <name>
              assign a label to an image

       -lat <width>x<height>{+-}<offset>{%}
              perform local adaptive thresholding

       -level <black_point>{,<gamma>}{,<white_point>}{%}
              adjust the level of image contrast

       -limit <type> <value>
              Disk, File, Map, Memory, Pixels, or Threads resource limit

       -linewidth
              the line width for subsequent draw operations

       -list <type>
              the type of list

       -log <string>
              Specify format for debug log

       -loop <iterations>
              add Netscape loop extension to your GIF animation

       -magnify
              magnify the image

       -map <filename>
              choose a particular set of colors from this image

       -mask <filename>
              Specify a clipping mask

       -matte store matte channel if the image has one

       -mattecolor <color>
              specify the color to be used with the -frame option

       -median <radius>
              apply a median filter to the image

       -minify <factor>
              minify the image

       -modulate brightness[,saturation[,hue]]
              vary the brightness, saturation, and hue of an image

       -monitor
              show progress indication

       -monochrome
              transform the image to black and white

       -motion-blur <radius>{x<sigma>}{+angle}
              Simulate motion blur

       -negate
              replace every pixel with its complementary color

       -noise <radius|type>
              add or reduce noise in an image

       -noop  NOOP (no option)

       -normalize
              transform image to span the full range of color values

       -opaque <color>
              change this color to the pen color within the image

       -operator channel operator rvalue[%]
              apply  a  mathematical,  bitwise,  or value operator to an image
              channel

       -ordered-dither <channeltype> <NxN>
              ordered dither the image

       -output-directory <directory>
              output files to directory

       -page <width>x<height>{+-}<x>{+-}<y>{%}{!}{<}{>}
              size and location of an image canvas

       -paint <radius>
              simulate an oil painting

       -pen <color>
              (This option has been replaced by the -fill option)

       -pointsize <value>
              pointsize of the PostScript, X11, or TrueType font

       -profile <filename>
              add ICM, IPTC, or generic profile  to image

       -quality <value>
              JPEG/MIFF/PNG/TIFF compression level

       -raise <width>x<height>
              lighten or darken image edges

       -random-threshold <channeltype> <LOWxHIGH>
              random threshold the image

       -recolor <matrix>
              apply a color translation matrix to image channels

       -red-primary <x>,<y>
              red chromaticity primary point

       -region <width>x<height>{+-}<x>{+-}<y>
              apply options to a portion of the image

       -render
              render vector operations

       -resample <horizontal>x<vertical>
              Resample image to specified horizontal and vertical resolution

       -resize <width>x<height>{%}{@}{!}{<}{>}
              resize an image

       -roll {+-}<x>{+-}<y>
              roll an image vertically or horizontally

       -rotate <degrees>{<}{>}
              rotate the image

       -sample <geometry>
              scale image using pixel sampling

       -sampling-factor <horizontal_factor>x<vertical_factor>
              chroma subsampling factors

       -scale <geometry>
              scale the image.

       -scene <value>
              set scene number

       -set <attribute> <value>
              set an image attribut

       -segment <cluster threshold>x<smoothing threshold>
              segment an image

       -shade <azimuth>x<elevation>
              shade the image using a distant light source

       -sharpen <radius>{x<sigma>}
              sharpen the image

       -shave <width>x<height>{%}
              shave pixels from the image edges

       -shear <x degrees>x<y degrees>
              shear the image along the X or Y axis

       -size <width>x<height>{+offset}
              width and height of the image

       -solarize <factor>
              negate all pixels above the threshold level

       -spread <amount>
              displace image pixels by a random amount

       -stroke <color>
              color to use when stroking a graphic primitive

       -strokewidth <value>
              set the stroke width

       -swirl <degrees>
              swirl image pixels about the center

       -texture <filename>
              name of texture to tile onto the image background

       -threshold <value>{%}
              threshold the image

       -thumbnail <width>x<height>{%}{@}{!}{<}{>}
              resize an image (quickly)

       -tile <filename>
              tile image when filling a graphic primitive

       -transform
              transform the image

       -transparent <color>
              make this color transparent within the image

       -treedepth <value>
              tree depth for the color reduction algorithm

       -trim  trim an image

       -type <type>
              the image type

       -units <type>
              the units of image resolution

       -unsharp <radius>{x<sigma>}{+<amount>}{+<threshold>}
              sharpen the image with an unsharp mask operator

       -verbose
              print detailed information about the image

       -version
              print GraphicsMagick version string

       -view <string>
              FlashPix viewing parameters

       -virtual-pixel <method>
              specify contents of "virtual pixels"

       -wave <amplitude>x<wavelength>
              alter an image along a sine wave

       -white-point <x>,<y>
              chromaticity white point

       -white-threshold red[,green][,blue][,opacity]
              pixels above the threshold become white

              For a more detailed description of  each  option,  see  Options,
              above.

GM MONTAGE

       montage creates a composite image by combining several separate images.
       The images are tiled on the composite image with the name of the  image
       optionally appearing just below the individual tile.

       The composite image is constructed in the following manner. First, each
       image specified on the command line, except for the last, is scaled  to
       fit the maximum tile size. The maximum tile size by default is 120x120.
       It can be modified with  the  -geometry  command  line  argument  or  X
       resource.  See  Options for more information on command line arguments.
       See X(1) for more information on X resources.  Note  that  the  maximum
       tile size need not be a square.

       Next the composite image is initialized with the color specified by the
       -background command line argument or X resource. The width  and  height
       of  the  composite  image  is  determined  by  the title specified, the
       maximum tile size, the number of tiles per row, the tile  border  width
       and height, the image border width, and the label height. The number of
       tiles per row specifies how many images are to appear in  each  row  of
       the  composite  image. The default is to have 5 tiles in each row and 4
       tiles in each column of the composite.  A specific value  is  specified
       with  -tile.  The  tile  border  width and height, and the image border
       width defaults to the value of the X resource -borderwidth. It  can  be
       changed  with  the -borderwidth or -geometry command line argument or X
       resource. The label height is determined by the font you  specify  with
       the  -font command line argument or X resource. If you do not specify a
       font, a font is chosen that allows the name of the  image  to  fit  the
       maximum  width  of a tiled area.  The label colors is determined by the
       -background and -fill command line argument or X resource.  Note,  that
       if the background and pen colors are the same, labels will not appear.

       Initially,  the  composite  image  title is placed at the top if one is
       specified (refer to -fill). Next, each image is set onto the  composite
       image,  surrounded  by  its  border  color, with its name centered just
       below it. The individual images are left-justified within the width  of
       the  tiled area.  The order of the images is the same as they appear on
       the command line unless the images have a scene  keyword.  If  a  scene
       number  is  specified in each image, then the images are tiled onto the
       composite in the  order  of  their  scene  number.  Finally,  the  last
       argument  on  the  command  line  is the name assigned to the composite
       image. By default, the image is written in the MIFF format and  can  be
       viewed or printed with display(1).

       Note,  that  if the number of tiles exceeds the default number of 20 (5
       per row, 4 per column), more than one composite image  is  created.  To
       ensure  a single image is produced, use -tile to increase the number of
       tiles to meet or exceed the number of input images.

       Finally, to create one or more empty spaces in the sequence  of  tiles,
       use the "NULL:" image format.

       Note,  a  composite  MIFF  image  displayed to an X server with display
       behaves differently than other images. You can think of  the  composite
       as  a visual image directory. Choose a particular tile of the composite
       and press a button to display it. See display(1) and miff(5)

EXAMPLES

       To create a montage of a cockatoo, a  parrot,  and  a  hummingbird  and
       write it to a file called birds, use:

           gm montage cockatoo.miff parrot.miff hummingbird.miff
                   birds.miff

       To  tile  several  bird  images  so that they are at most 256 pixels in
       width and 192 pixels  in  height,  surrounded  by  a  red  border,  and
       separated by 10 pixels of background color, use:

           gm montage -geometry 256x192+10+10 -bordercolor red
                   birds.* montage.miff

       To  create an unlabeled parrot image, 640 by 480 pixels, and surrounded
       by a border of black, use:

           gm montage -geometry 640x480 -bordercolor black
                   -label "" parrot.miff bird.miff

       To create an image of an eagle with a textured background, use:

           gm montage -texture bumps.jpg eagle.jpg eagle.png

       To join several GIF images together  without  any  extraneous  graphics
       (e.g.  no label, no shadowing, no surrounding tile frame), use:

           gm montage +frame +shadow +label -tile 5x1
                   -geometry 50x50+0+0 *.png joined.png

OPTIONS

       Any  option  you  specify on the command line remains in effect for the
       group of images following it, until the  group  is  terminated  by  the
       appearance  of  any option or -noop.  For example, to make a montage of
       three images, the first with 32 colors, the second  with  an  unlimited
       number of colors, and the third with only 16 colors, use:

            gm montage -colors 32 cockatoo.1 -noop cockatoo.2
                    -colors 16 cockatoo.3 cockatoos.miff

       For a more detailed description of each option, see Options, above.

       -adjoin
              join images into a single multi-image file

       -affine <matrix>
              drawing transform matrix

       -authenticate <string>
              decrypt image with this password

       -background <color>
              the background color

       -blue-primary <x>,<y>
              blue chromaticity primary point

       -blur <radius>{x<sigma>}
              blur the image with a Gaussian operator

       -bordercolor <color>
              the border color

       -borderwidth <geometry>
              the border width

       -chop <width>x<height>{+-}<x>{+-}<y>{%}
              remove pixels from the interior of an image

       -colors <value>
              preferred number of colors in the image

       -colorspace <value>
              the type of colorspace

       -comment <string>
              annotate an image with a comment

       -compose <operator>
              the type of image composition

       -compress <type>
              the type of image compression

       -crop <width>x<height>{+-}<x>{+-}<y>{%}
              preferred size and location of the cropped image

       -debug <events>
              enable debug printout

       -define <key>{=<value>},...
              add coder/decoder specific options

       -density <width>x<height>
              horizontal and vertical resolution in pixels of the image

       -depth <value>
              depth of the image

       -display <host:display[.screen]>
              specifies the X server to contact

       -dispose <method>
              GIF disposal method

       -dither
              apply Floyd/Steinberg error diffusion to the image

       -draw <string>
              annotate an image with one or more graphic primitives

       -encoding <type>
              specify the text encoding

       -endian <type>
              specify endianness (MSB, LSB, or Native) of image

       -fill <color>
              color to use when filling a graphic primitive

       -filter <type>
              use this type of filter when resizing an image

       -font <name>
              use this font when annotating the image with text

       -frame <width>x<height>+<outer bevel width>+<inner bevel width>
              surround the image with an ornamental border

       -gamma <value>
              level of gamma correction

       -geometry <width>x<height>{+-}<x>{+-}<y>{%}{@}{!}{^}{<}{>}
              preferred size and location of the Image window.

       -gravity <type>
              direction primitive  gravitates to when annotating the image.

       -green-primary <x>,<y>
              green chromaticity primary point

       -help  print usage instructions

       -interlace <type>
              the type of interlacing scheme

       -label <name>
              assign a label to an image

       -limit <type> <value>
              Disk, File, Map, Memory, Pixels, or Threads resource limit

       -log <string>
              Specify format for debug log

       -matte store matte channel if the image has one

       -mattecolor <color>
              specify the color to be used with the -frame option

       -mode <value>
              mode of operation

       -monitor
              show progress indication

       -monochrome
              transform the image to black and white

       -noop  NOOP (no option)

       -page <width>x<height>{+-}<x>{+-}<y>{%}{!}{<}{>}
              size and location of an image canvas

       -pen <color>
              (This option has been replaced by the -fill option)

       -pointsize <value>
              pointsize of the PostScript, X11, or TrueType font

       -quality <value>
              JPEG/MIFF/PNG/TIFF compression level

       -red-primary <x>,<y>
              red chromaticity primary point

       -render
              render vector operations

       -resize <width>x<height>{%}{@}{!}{<}{>}
              resize an image

       -rotate <degrees>{<}{>}
              rotate the image

       -sampling-factor <horizontal_factor>x<vertical_factor>
              chroma subsampling factors

       -scenes <value-value>
              range of image scene numbers to read

       -shadow <radius>{x<sigma>}
              shadow the montage

       -sharpen <radius>{x<sigma>}
              sharpen the image

       -size <width>x<height>{+offset}
              width and height of the image

       -stroke <color>
              color to use when stroking a graphic primitive

       -strokewidth <value>
              set the stroke width

       -texture <filename>
              name of texture to tile onto the image background

       -thumbnail <width>x<height>{%}{@}{!}{<}{>}
              resize an image (quickly)

       -tile <geometry>
              layout of images [montage]

       -title <string>
              assign title to displayed image [animate, display, montage]

       -transform
              transform the image

       -transparent <color>
              make this color transparent within the image

       -treedepth <value>
              tree depth for the color reduction algorithm

       -trim  trim an image

       -type <type>
              the image type

       -verbose
              print detailed information about the image

       -version
              print GraphicsMagick version string

       -white-point <x>,<y>
              chromaticity white point

              For  a  more  detailed  description of each option, see Options,
              above.

X RESOURCES

       Montage options can appear on the command line or in  your  X  resource
       file.  Options on the command line supersede values specified in your X
       resource file. See X(1) for more information on X resources.

       All montage options have  a  corresponding  X  resource.  In  addition,
       montage uses the following X resources:

       background (class Background)
              background color

              Specifies  the  preferred  color  to use for the composite image
              background.  The default is #ccc.

       borderColor (class BorderColor)
              border color

              Specifies the preferred color to use  for  the  composite  image
              border. The default is #ccc.

       borderWidth (class BorderWidth)
              border width

              Specifies the width in pixels of the composite image border. The
              default is 2.

       font (class Font)
              font to use

              Specifies the name of the preferred font to use when  displaying
              text  within the composite image. The default is 9x15, fixed, or
              5x8 determined by the composite image size.

       matteColor (class MatteColor)
              color of the frame

              Specify the color of an image frame. A 3D effect is achieved  by
              using  highlight  and shadow colors derived from this color. The
              default value is #697B8F.

       pen (class Pen)
              text color

              Specifies the  preferred  color  to  use  for  text  within  the
              composite image.  The default is black.

       title (class Title)
              composite image title

              This resource specifies the title to be placed at the top of the
              composite image. The default is not to place a title at the  top
              of the composite image.

ENVIRONMENT

       COLUMNS
              Output  screen  width. Used when formatting text for the screen.
              Many Unix systems keep this shell variable up to  date,  but  it
              may  need  to be explicitly exported in order for GraphicsMagick
              to see it.

       DISPLAY
              X11 display ID (host, display number, and  screen  in  the  form
              hostname:display.screen).

       HOME   Location  of  user's home directory. GraphicsMagick searches for
              configuration files in $HOME/.magick if  the  directory  exists.
              See    MAGICK_CODER_MODULE_PATH,    MAGICK_CONFIGURE_PATH,   and
              MAGICK_FILTER_MODULE_PATH if more flexibility is needed.

       MAGICK_CODER_STABILITY
              The minimum coder stability level before it will  be  used.  The
              available levels are PRIMARY, STABLE, and UNSTABLE.  The default
              minimum level is UNSTABLE, which means that all available coders
              will  be  used.  The  purpose  of  this  option is to reduce the
              security exposure (or  apparent  complexity)  due  to  the  huge
              number  of  formats  supported.  Coders at the PRIMARY level are
              commonly used formats with very well maintained implementations.
              Coders  at  the  STABLE level are reasonably well maintained but
              represent less used formats. Coders at the UNSTABLE level either
              have  weak  implementations,  the file format itself is weak, or
              the probability the coder will be needed is vanishingly small.

       MAGICK_CODER_MODULE_PATH
              Search path  to  use  when  searching  for  image  format  coder
              modules.   This  path  allows the user to arbitrarily extend the
              image formats supported by  GraphicsMagick  by  adding  loadable
              modules  to  an arbitrary location rather than copying them into
              the GraphicsMagick installation directory. The formatting of the
              search  path  is  similar to operating system search paths (i.e.
              colon delimited for Unix, and semi-colon delimited for Microsoft
              Windows).  This user specified search path is used before trying
              the default search path.

       MAGICK_CONFIGURE_PATH
              Search path to  use  when  searching  for  configuration  (.mgk)
              files.   The  formatting  of  the  search  path  is  similar  to
              operating system search paths (i.e. colon  delimited  for  Unix,
              and  semi-colon  delimited  for  Microsoft  Windows).  This user
              specified search path is used before trying the  default  search
              path.

       MAGICK_DEBUG
              Debug options (see -debug for details)

       MAGICK_FILTER_MODULE_PATH
              Search  path  to  use  when searching for filter process modules
              (invoked via -process). This path allows the user to arbitrarily
              extend GraphicsMagick's image processing functionality by adding
              loadable modules to an arbitrary location  rather  than  copying
              them   into   the  GraphicsMagick  installation  directory.  The
              formatting of the search path is  similar  to  operating  system
              search  paths  (i.e.  colon  delimited  for Unix, and semi-colon
              delimited for Microsoft Windows).  This  user  specified  search
              path is used before trying the default search path.

       MAGICK_HOME
              Path  to  top  of  GraphicsMagick  installation  directory. Only
              observed by "uninstalled" builds of GraphicsMagick which do  not
              have their location hard-coded or set by an installer.

       MAGICK_MMAP_READ
              If  MAGICK_MMAP_READ is set to TRUE, GraphicsMagick will attempt
              to  memory-map  the  input  file  for  reading.   This   usually
              substantially improves read performance if the file has recently
              been read.  However,  testing  shows  that  performance  may  be
              reduced  for  files  accessed  for  the first time via a network
              since some  operating  systems  failed  to  do  read-ahead  over
              network mounts for memory mapped files.

       MAGICK_MMAP_WRITE
              If MAGICK_MMAP_WRITE is set to TRUE, GraphicsMagick will attempt
              to  memory-map  the  output  file  for  writing.  This   is   an
              experimental   feature   (which   is  currently  broken).  Write
              performance is usually somewhat worse when using  this  approach
              rather than the default one.

       MAGICK_IO_FSYNC
              If  MAGICK_IO_FSYNC  is  set  to  TRUE, then GraphicsMagick will
              request that the output file is fully flushed  and  synchronized
              to  disk  when  it is closed. This incurs a performance penalty,
              but has the benefit that  if  the  power  fails  or  the  system
              crashes,  the  file  should be valid on disk. If image files are
              referenced from a database, then this option helps  assure  that
              the files referenced by the database are valid.

       MAGICK_IOBUF_SIZE
              The  amount  of I/O buffering (in bytes) to use when reading and
              writing encoded files. The default is 16384, which  is  observed
              to  work  well  for  many  cases.  The  best  value  for a local
              filesystem is usually the the native filesystem block size (e.g.
              4096,  8192,  or  even 131,072 for ZFS) in order to minimize the
              number of physical disk  I/O  operations.   I/O  performance  to
              files  accessed  over  a  network  may  benefit significantly by
              tuning this option. Larger values  are  not  necessarily  better
              (they  may  be  slower!),  and  there is rarely any benefit from
              using values larger than 32768. Use convert's -verbose option in
              order  to  evaluate  read  and  write rates in pixels per second
              while keeping in mind that the  operating  system  will  try  to
              cache files in RAM.

       MAGICK_LIMIT_DISK
              Maximum amount of disk space allowed for use by the pixel cache.

       MAGICK_LIMIT_FILES
              Maximum number of open files.

       MAGICK_LIMIT_MAP
              Maximum size of a memory map.

       MAGICK_LIMIT_MEMORY
              Maximum amount of memory to allocate from the heap.

       MAGICK_TMPDIR
              Path  to  directory  where GraphicsMagick should write temporary
              files. The default is to use the system default, or the location
              set by TMPDIR.

       TMPDIR For  POSIX-compatible systems (Unix-compatible), the path to the
              directory where all applications should write  temporary  files.
              Overridden by MAGICK_TMPDIR if it is set.

       TMP or TEMP
              For   Microsoft   Windows,  the  path  to  the  directory  where
              applications  should  write  temporary  files.   Overridden   by
              MAGICK_TMPDIR if it is set.

       OMP_NUM_THREADS
              As per the OpenMP standard, this specifies the number of threads
              to use in parallel regions. Some compilers default the number of
              threads  to use to the number of processor cores available while
              others default to just one thread. See the OpenMP  specification
              for  other  standard  adjustments and your compiler's manual for
              vendor-specific settings.

CONFIGURATION FILES

       GraphicsMagick uses a number of XML format configuration files:

       colors.mgk
              colors configuration file

                <?xml version="1.0"?>
                <colormap>
                  <color name="AliceBlue" red="240" green="248" blue="255"
                         compliance="SVG, X11, XPM" />
                </colormap>

       delegates.mgk
              delegates configuration file

       log.mgk
              logging configuration file

                <?xml version="1.0"?>
                <magicklog>
                  <log events="None" />
                  <log output="stdout" />
                  <log filename="Magick-%d.log" />
                  <log generations="3" />
                  <log limit="2000" />
                  <log format="%t %r %u %p %m/%f/%l/%d:\n  %e"  />
                </magicklog>

       modules.mgk
              loadable modules configuration file

                <?xml version="1.0"?>
                <modulemap>
                  <module magick="8BIM" name="META" />
                </modulemap>

       type.mgk
              master type (fonts) configuration file

                <?xml version="1.0"?>
                <typemap>
                  <include file="type-windows.mgk" />
                  <type
                    name="AvantGarde-Book"
                    fullname="AvantGarde Book"
                    family="AvantGarde"
                    foundry="URW"
                    weight="400"
                    style="normal"
                    stretch="normal"
                    format="type1"
                    metrics="/usr/local/share/ghostscript/fonts/a010013l.afm"
                    glyphs="/usr/local/share/ghostscript/fonts/a010013l.pfb"
                  />
                </typemap>

ACKNOWLEDGEMENTS

       The MIT X Consortium for making network transparent graphics a reality.

       Michael  Halle,  Spatial  Imaging  Group  at  MIT,  for   the   initial
       implementation of Alan Paeth's image rotation algorithm.

       David  Pensak,  E.  I.  du Pont de Nemours and Company, for providing a
       computing environment that made this program possible.

       Peder Langlo, Hewlett Packard, Norway, made hundreds of suggestions and
       bug reports. Without Peder, this software would not be nearly as useful
       as it is today.

       Rod Bogart and John W. Peterson, University of Utah.  Image compositing
       is loosely based on rlecomp of the Utah Raster Toolkit.

       Paul  Heckbert,  Carnegie Mellon University. Image resizing is based on
       his Zoom program.

       Paul  Raveling,  USC  Information  Sciences  Institute.   The   spatial
       subdivision color reduction algorithm is based on his Img software.

COPYRIGHT

       Copyright  (C)  2002  -  2010  GraphicsMagick  Group,  an  organization
       dedicated to making software imaging solutions freely available.

       Permission is hereby granted, free of charge, to any person obtaining a
       copy    of   this   software   and   associated   documentation   files
       ("GraphicsMagick"), to  deal  in  GraphicsMagick  without  restriction,
       including  without  limitation  the rights to use, copy, modify, merge,
       publish, distribute, sublicense, and/or sell copies of  GraphicsMagick,
       and  to  permit  persons  to whom GraphicsMagick is furnished to do so,
       subject to the following conditions:

       The above copyright notice and this permission notice shall be included
       in all copies or substantial portions of GraphicsMagick.

       The software is provided "as is", without warranty of any kind, express
       or  implied,  including  but  not  limited   to   the   warranties   of
       merchantability,  fitness for a particular purpose and noninfringement.
       In no event shall GraphicsMagick Group be liable for any claim, damages
       or  other  liability,  whether  in  an  action  of  contract,  tort  or
       otherwise, arising from, out of or in connection with GraphicsMagick or
       the use or other dealings in GraphicsMagick.

       Except  as  contained  in  this  notice, the name of the GraphicsMagick
       Group shall not be used in advertising  or  otherwise  to  promote  the
       sale,  use  or  other  dealings in GraphicsMagick without prior written
       authorization from the GraphicsMagick Group.

       Additional copyrights and licenses apply to this software.  You  should
       have  received  a  copy  of  Copyright.txt  with  this  package,  which
       describes additional  copyrights  and  licenses  which  apply  to  this
       software; otherwise see http://www.graphicsmagick.org/Copyright.html.