Provided by: gmt_4.5.11-1build1_amd64 bug


       psscale - Plot gray scale or color scale on maps


       psscale  -Dxpos/ypos/length/width[h]  [ -A[a|l|c] ] [ -B[p|s]parameters ] [ -Ccpt_file ] [
       -E[b|f][length] ] [ -I[max_intens|low_i/high_i] ] [ -K ] [ -L[i][gap] ] [ -M ] [ -Ndpi ] [
       -O  ]  [  -P  ]  [  -Q  ]  [ -U[just/dx/dy/][c|label] ] [ -V ] [ -X[a|c|r][x-shift[u]] ] [
       -Y[a|c|r][y-shift[u]] ] [ -Zzfile ] [ -ccopies ]


       psscale plots gray scales or color scales on maps.  Both horizontal  and  vertical  scales
       are  supported.  For cpt_files with gradational colors (i.e., the lower and upper boundary
       of an interval have different r/g/b values) psscale will interpolate to give a  continuous
       scale.   Variations  in  intensity due to shading/illumination may be displayed by setting
       the option -I.  Colors may be spaced according to a linear scale, all be equal size, or by
       providing a file with individual tile widths.

       -D     Defines  the  position of the center/top (for horizontal scale) or center/left (for
              vertical scale) and the dimensions of the scale.  Give a negative length to reverse
              the scalebar.  Append h to get a horizontal scale [Default is vertical].


       No space between the option flag and the associated arguments.

       -A     Place  annotations  and labels above (instead of below) horizontal scalebars and to
              the left (instead of the right) of vertical scalebars.  Append a or l to move  only
              the  annotations  or  the label to the other side.  Append c if you want to print a
              vertical label as a column of characters (does not work with special characters).

       -B     Set annotation, tick, and gridline interval for the  colorbar.   The  x-axis  label
              will  plot beneath a horizontal bar (or vertically to the right of a vertical bar),
              except when using -A.  As an option, use the y-axis label to plot the data unit  to
              the  right of a horizontal bar (and above a vertical bar).  If -B is omitted, or no
              annotation intervals are provided, the default is to  annotate  every  color  level
              based  on  the  numerical  entries  in the cpt file (which may be overridden by ULB
              flags in the cpt file).  To specify custom text annotations for intervals, you must
              append ;annotation to each z-slice in the cpt file.

       -C     cpt_file  is  the  color palette file to be used.  By default all color changes are
              annotated.  To use a subset, add an extra column to the cpt-file with a L, U, or  B
              to  annotate  Lower,  Upper, or Both color segment boundaries (but see -B).  If not
              given, psscale will read stdin.   Like  grdview,  psscale  can  understand  pattern
              specifications in the cpt file.

       -E     Add  sidebar triangles for back- and/or foreground colors.  Add f or b for only one
              sidebar triangle [Default gives both].  Optionally, append triangle height [Default
              is half the barwidth].

       -I     Add  illumination  effects.   Optionally,  set the range of intensities from - to +
              max_intens.   If  not  specified,  1  is  used.   Alternatively,  append   low/high
              intensities to specify an asymmetric range [Default is no illumination].

       -K     More PostScript code will be appended later [Default terminates the plot system].

       -L     Gives  equal-sized color rectangles.  Default scales rectangles according to the z-
              range in the cpt-file  (Also see -Z).  If set, any equal  interval  annotation  set
              with  -B will be ignored.  If gap is appended and the cpt table is discrete we will
              center each annotation on each rectangle, using the lower boundary z-value for  the
              annotation.   If  i  is prepended we annotate the interval range instead.  If -I is
              used then each rectangle will have its constant color  modified  by  the  specified

       -M     Force a monochrome graybar using the (television) YIQ transformation.

       -N     Effective dots-per-inch for the rectangular image making up the color scale [300].

       -O     Selects Overlay plot mode [Default initializes a new plot system].

       -P     Selects  Portrait  plotting  mode  [Default is Landscape, see gmtdefaults to change

       -Q     Select logarithmic scale and power of ten annotations.  All  z-values  in  the  cpt
              file  will be converted to p = log10(z) and only integer p values will be annotated
              using the 10^p format [Default is linear scale].

       -S     Do not separate different colour intervals with black lines.

       -U     Draw Unix System time stamp on plot.  By adding just/dx/dy/, the user  may  specify
              the justification of the stamp and where the stamp should fall on the page relative
              to lower left corner of the plot.  For example, BL/0/0 will align  the  lower  left
              corner  of  the  time  stamp  with  the lower left corner of the plot.  Optionally,
              append a label, or c (which will plot the command  string.).   The  GMT  parameters
              UNIX_TIME,  UNIX_TIME_POS,  and UNIX_TIME_FORMAT can affect the appearance; see the
              gmtdefaults man page for details.  The time string will be in the locale set by the
              environment variable TZ (generally local time).

       -V     Selects  verbose  mode,  which  will  send progress reports to stderr [Default runs

       -X -Y  Shift  plot  origin  relative  to  the  current  origin  by  (x-shift,y-shift)  and
              optionally  append  the  length  unit (c, i, m, p).  You can prepend a to shift the
              origin back to the original position after plotting, or  prepend   r  [Default]  to
              reset  the  current origin to the new location.  If -O is used then the default (x-
              shift,y-shift)  is  (0,0),  otherwise  it  is  (r1i,  r1i)   or   (r2.5c,   r2.5c).
              Alternatively,  give c to align the center coordinate (x or y) of the plot with the
              center of the page based on current page size.

       -Z     File with colorbar-width per color entry.  By default, width of entry is scaled  to
              color range, i.e., z = 0-100 gives twice the width as z = 100-150 (Also see -L).

       -c     Specifies the number of plot copies. [Default is 1].


       To  append  a vertical color scale (7.5 cm long; 1.25 cm wide) to the right of a plot that
       is 6 inch wide and 4 inch high, using illumination, and show back- and foreground  colors,
       and annotating every 5 units, use

       psscale -D 6.5i/2i/7.5c/1.25c -O -C colors.cpt -I -E -B 5:BATHYMETRY:/:m: >>


       When  the  cpt  file  is  discrete and no illumination is specified, the color bar will be
       painted using polygons.  For all other cases we must paint  with  an  image.   Some  color
       printers  may  give  slightly  different  colors  for  the two methods given identical RGB


       GMT(1), makecpt(1), grd2cpt(1)