Provided by: libtiff4-dev_3.9.5-2ubuntu1_amd64 bug


       libtiff - introduction to libtiff, a library for reading and writing TIFF files


       #include <tiffio.h>

       cc file.c -ltiff


       libtiff  is  a  library for reading and writing data files encoded with the Tag Image File
       format, Revision 6.0 (or revision 5.0 or revision 4.0). This file format is  suitable  for
       archiving multi-color and monochromatic image data.

       The  library  supports  several  compression  algorithms,  as indicated by the Compression
       field, including: no compression (1), CCITT 1D Huffman  compression  (2),  CCITT  Group  3
       Facsimile  compression  (3),  CCITT  Group 4 Facsimile compression (4), Lempel-Ziv & Welch
       compression (5), baseline  JPEG  compression  (7),  word-aligned  1D  Huffman  compression
       (32771),  and  PackBits compression (32773).  In addition, several nonstandard compression
       algorithms are supported: the 4-bit compression algorithm used by the ThunderScan  program
       (32809)  (decompression  only),  NeXT's 2-bit compression algorithm (32766) (decompression
       only), an experimental LZ-style algorithm known as Deflate (32946),  and  an  experimental
       CIE  LogLuv compression scheme designed for images with high dynamic range (32845 for LogL
       and 32845 for LogLuv).  Directory information may be in either little- or big-endian  byte
       order-byte  swapping is automatically done by the library. Data bit ordering may be either
       Most Significant Bit (MSB) to Least Significant Bit (LSB) or LSB  to  MSB.   Finally,  the
       library does not support files in which the BitsPerSample, Compression, MinSampleValue, or
       MaxSampleValue fields are defined differently on a  per-sample  basis  (in  Rev.  6.0  the
       Compression tag is not defined on a per-sample basis, so this is immaterial).


       The  library  makes  extensive  use  of  C  typedefs  to promote portability.  Two sets of
       typedefs are used, one for communication with clients of the library and one for  internal
       data  structures  and  parsing  of the TIFF format.  The following typedefs are exposed to
       users either through function definitions or through parameters passed through the varargs
            typedef unsigned short uint16;      16-bit unsigned integer
            typedef unsigned <thing> uint32;    32-bit unsigned integer
            typedef unsigned int ttag_t;        directory tag
            typedef uint16 tdir_t;              directory index
            typedef uint16 tsample_t;           sample number
            typedef uint32 tstrip_t;            strip number
            typedef uint32 ttile_t;             tile number
            typedef int32 tsize_t;              i/o size in bytes
            typedef void* tdata_t;              image data ref
            typedef void* thandle_t;            client data handle
            typedef int32 toff_t;               file offset
       Note  that  tstrip_t,  ttile_t,  and  tsize_t  are  constrained  to be no more than 32-bit
       quantities by 32-bit fields they are stored in in the TIFF image.  Likewise  tsample_t  is
       limited  by the 16-bit field used to store the SamplesPerPixel tag.  tdir_t constrains the
       maximum number of IFDs that may appear in an image and  may  be  an  arbitrary  size  (w/o
       penalty).  ttag_t must be either int, unsigned int, pointer, or double because the library
       uses a varargs interface and ANSI C restricts the type of the parameter before an ellipsis
       to  be  a  promoted  type.   toff_t  is  defined  as  int32  because TIFF file offsets are
       (unsigned) 32-bit quantities. A signed value is used because some interfaces return -1  on
       error.  Finally, note that user-specified data references are passed as opaque handles and
       only cast at the lowest layers where their type is presumed.


       The following routines are part of the library. Consult specific manual pages for  details
       on their operation; on most systems doing ``man function-name'' will work.

       Name                     Description
       TIFFCheckpointDirectory  writes the current state of the directory
       TIFFCheckTile            very x,y,z,sample is within image
       TIFFCIELabToRGBInit      initialize CIE L*a*b* 1976 to RGB conversion state
       TIFFCIELabToXYZ          perform CIE L*a*b* 1976 to CIE XYZ conversion
       TIFFClientOpen           open a file for reading or writing
       TIFFClose                close an open file
       TIFFComputeStrip         return strip containing y,sample
       TIFFComputeTile          return tile containing x,y,z,sample
       TIFFCurrentDirectory     return index of current directory
       TIFFCurrentRow           return index of current scanline
       TIFFCurrentStrip         return index of current strip
       TIFFCurrentTile          return index of current tile
       TIFFDataWidth            return the size of TIFF data types
       TIFFError                library error handler
       TIFFFdOpen               open a file for reading or writing
       TIFFFileName             return name of open file
       TIFFFileno               return open file descriptor
       TIFFFindCODEC            find standard codec for the specific scheme
       TIFFFlush                flush all pending writes
       TIFFFlushData            flush pending data writes
       TIFFGetBitRevTable       return bit reversal table
       TIFFGetField             return tag value in current directory
       TIFFGetFieldDefaulted    return tag value in current directory
       TIFFGetMode              return open file mode
       TIFFGetVersion           return library version string
       TIFFIsCODECConfigured    check, whether we have working codec
       TIFFIsMSB2LSB            return true if image data is being returned
                                with bit 0 as the most significant bit
       TIFFIsTiled              return true if image data is tiled
       TIFFIsByteSwapped        return true if image data is byte-swapped
       TIFFNumberOfStrips       return number of strips in an image
       TIFFNumberOfTiles        return number of tiles in an image
       TIFFOpen                 open a file for reading or writing
       TIFFPrintDirectory       print description of the current directory
       TIFFReadBufferSetup      specify i/o buffer for reading
       TIFFReadDirectory        read the next directory
       TIFFReadEncodedStrip     read and decode a strip of data
       TIFFReadEncodedTile      read and decode a tile of data
       TIFFReadRawStrip         read a raw strip of data
       TIFFReadRawTile          read a raw tile of data
       TIFFReadRGBAImage        read an image into a fixed format raster
       TIFFReadScanline         read and decode a row of data
       TIFFReadTile             read and decode a tile of data
       TIFFRegisterCODEC        override standard codec for the specific scheme
       TIFFReverseBits          reverse bits in an array of bytes
       TIFFRGBAImageBegin       setup decoder state for TIFFRGBAImageGet
       TIFFRGBAImageEnd         release TIFFRGBAImage decoder state
       TIFFRGBAImageGet         read and decode an image
       TIFFRGBAImageOK          is image readable by TIFFRGBAImageGet
       TIFFScanlineSize         return size of a scanline
       TIFFSetDirectory         set the current directory
       TIFFSetSubDirectory      set the current directory
       TIFFSetErrorHandler      set error handler function
       TIFFSetField             set a tag's value in the current directory
       TIFFSetWarningHandler    set warning handler function
       TIFFStripSize            returns size of a strip
       TIFFRawStripSize         returns the number of bytes in a raw strip
       TIFFSwabShort            swap bytes of short
       TIFFSwabLong             swap bytes of long
       TIFFSwabArrayOfShort     swap bytes of an array of shorts
       TIFFSwabArrayOfLong      swap bytes of an array of longs
       TIFFTileRowSize          return size of a row in a tile
       TIFFTileSize             return size of a tile
       TIFFUnRegisterCODEC      unregisters the codec
       TIFFVGetField            return tag value in current directory
       TIFFVGetFieldDefaulted   return tag value in current directory
       TIFFVSetField            set a tag's value in the current directory
       TIFFVStripSize           returns the number of bytes in a strip
       TIFFWarning              library warning handler
       TIFFWriteDirectory       write the current directory
       TIFFWriteEncodedStrip    compress and write a strip of data
       TIFFWriteEncodedTile     compress and write a tile of data
       TIFFWriteRawStrip        write a raw strip of data
       TIFFWriteRawTile         write a raw tile of data
       TIFFWriteScanline        write a scanline of data
       TIFFWriteTile            compress and write a tile of data
       TIFFXYZToRGB             perform CIE XYZ to RGB conversion
       TIFFYCbCrToRGBInit       initialize YCbCr to RGB conversion state
       TIFFYCbCrtoRGB           perform YCbCr to RGB conversion

       Auxiliary functions:
       _TIFFfree                free memory buffer
       _TIFFmalloc              dynamically allocate memory buffer
       _TIFFmemcmp              compare contents of the memory buffers
       _TIFFmemcpy              copy contents of the one buffer to another
       _TIFFmemset              fill memory buffer with a constant byte
       _TIFFrealloc             dynamically reallocate memory buffer


       The table below lists the TIFF tags that are recognized and handled by the library.  If no
       use is indicated in the table, then the library reads and writes the tag, but does not use
       it  internally.   Note  that  some  tags are meaningful only when a particular compression
       scheme is being used; e.g.  Group3Options is only useful if Compression is  set  to  CCITT
       Group  3  encoding.   Tags of this sort are considered codec-specific tags and the library
       does not recognize them except when the Compression tag has been  previously  set  to  the
       relevant compression scheme.

       Tag Name                Value  R/W  Library Use/Notes
       Artist                  315    R/W
       BadFaxLines             326    R/W
       BitsPerSample           258    R/W  lots
       CellLength              265         parsed but ignored
       CellWidth               264         parsed but ignored
       CleanFaxData            327    R/W
       ColorMap                320    R/W
       ColorResponseUnit       300         parsed but ignored
       Compression             259    R/W  choosing codec
       ConsecutiveBadFaxLines  328    R/W
       Copyright       33432   R/W
       DataType                32996  R    obsoleted by SampleFormat tag
       DateTime                306    R/W
       DocumentName            269    R/W
       DotRange                336    R/W
       ExtraSamples            338    R/W  lots
       FaxRecvParams           34908  R/W
       FaxSubAddress           34909  R/W
       FaxRecvTime             34910  R/W
       FillOrder               266    R/W  control bit order
       FreeByteCounts          289         parsed but ignored
       FreeOffsets             288         parsed but ignored
       GrayResponseCurve       291         parsed but ignored
       GrayResponseUnit        290         parsed but ignored
       Group3Options           292    R/W  used by Group 3 codec
       Group4Options           293    R/W
       HostComputer            316    R/W
       ImageDepth              32997  R/W  tile/strip calculations
       ImageDescription        270    R/W
       ImageLength             257    R/W  lots
       ImageWidth              256    R/W  lots
       InkNames                333    R/W
       InkSet                  332    R/W
       JPEGTables              347    R/W  used by JPEG codec
       Make                    271    R/W
       Matteing                32995  R    obsoleted by ExtraSamples tag
       MaxSampleValue          281    R/W
       MinSampleValue          280    R/W
       Model                   272    R/W
       NewSubFileType          254    R/W  called SubFileType in spec
       NumberOfInks            334    R/W
       Orientation             274    R/W
       PageName                285    R/W
       PageNumber              297    R/W
       PhotometricInterpretation      262  R/Wused by Group 3 and JPEG codecs
       PlanarConfiguration     284    R/W  data i/o
       Predictor               317    R/W  used by LZW and Deflate codecs
       PrimaryChromacities     319    R/W
       ReferenceBlackWhite     532    R/W
       ResolutionUnit          296    R/W  used by Group 3 codec
       RowsPerStrip            278    R/W  data i/o
       SampleFormat            339    R/W
       SamplesPerPixel         277    R/W  lots
       SMinSampleValue         340    R/W
       SMaxSampleValue         341    R/W
       Software                305    R/W
       StoNits                 37439  R/W
       StripByteCounts         279    R/W  data i/o
       StripOffsets            273    R/W  data i/o
       SubFileType             255    R/W  called OSubFileType in spec
       TargetPrinter           337    R/W
       Thresholding            263    R/W
       TileByteCounts          324    R/W  data i/o
       TileDepth               32998  R/W  tile/strip calculations
       TileLength              323    R/W  data i/o
       TileOffsets             324    R/W  data i/o
       TileWidth               322    R/W  data i/o
       TransferFunction        301    R/W
       WhitePoint              318    R/W
       XPosition               286    R/W
       XResolution             282    R/W
       YCbCrCoefficients       529    R/W  used by TIFFRGBAImage support
       YCbCrPositioning        531    R/W  tile/strip size calulcations
       YCbCrSubsampling        530    R/W
       YPosition               286    R/W
       YResolution             283    R/W  used by Group 3 codec


       In addition to the normal TIFF tags the library supports a collection of tags whose values
       lie in a range outside the valid range of TIFF tags.  These tags are termed pseud-tags and
       are  used to control various codec-specific functions within the library.  The table below
       summarizes the defined pseudo-tags.

       Tag Name                Codec  R/W  Library Use/Notes
       TIFFTAG_FAXMODE         G3     R/W  general codec operation
       TIFFTAG_FAXFILLFUNC     G3/G4  R/W  bitmap fill function
       TIFFTAG_JPEGQUALITY     JPEG   R/W  compression quality control
       TIFFTAG_JPEGCOLORMODE   JPEG   R/W  control colorspace conversions
       TIFFTAG_JPEGTABLESMODE  JPEG   R/W  control contents of JPEGTables tag
       TIFFTAG_ZIPQUALITY      Deflate     R/Wcompression quality level
       TIFFTAG_PIXARLOGDATAFMT PixarLog    R/Wuser data format
       TIFFTAG_PIXARLOGQUALITY PixarLog    R/Wcompression quality level
       TIFFTAG_SGILOGDATAFMT   SGILog R/W  user data format

              Control the operation of the Group 3 codec.  Possible values (independent bits that
              can  be  combined  by  or'ing them together) are: FAXMODE_CLASSIC (enable old-style
              format in which the RTC is written at the end of  the  last  strip),  FAXMODE_NORTC
              (opposite  of  FAXMODE_CLASSIC;  also called FAXMODE_CLASSF), FAXMODE_NOEOL (do not
              write EOL codes at the start of each row of data),  FAXMODE_BYTEALIGN  (align  each
              encoded  row to an 8-bit boundary), FAXMODE_WORDALIGN (align each encoded row to an
              16-bit boundary), The default value is dependent on the  compression  scheme;  this
              pseudo-tag is used by the various G3 and G4 codecs to share code.

              Control  the  function used to convert arrays of black and white runs to packed bit
              arrays.  This hook can be used  to  image  decoded  scanlines  in  multi-bit  depth
              rasters  (e.g.  for  display  in colormap mode) or for other purposes.  The default
              value is a pointer to a builtin function that images packed bilevel data.

              Tag contaings image metadata per the IPTC  newsphoto  spec:  Headline,  captioning,
              credit, etc... Used by most wire services.

              Tag  contains  Photoshop  captioning  information  and  metadata. Photoshop uses in
              parallel and redundantly alongside IPTCNEWSPHOTO information.

              Control the compression quality level used in the baseline  algorithm.   Note  that
              quality levels are in the range 0-100 with a default value of 75.

              Control  whether  or  not  conversion  is  done  between RGB and YCbCr colorspaces.
              Possible values are: JPEGCOLORMODE_RAW  (do  not  convert),  and  JPEGCOLORMODE_RGB
              (convert to/from RGB) The default value is JPEGCOLORMODE_RAW.

              Control   the   information   written  in  the  JPEGTables  tag.   Possible  values
              (independent  bits  that  can  be  combined   by   or'ing   them   together)   are:
              JPEGTABLESMODE_QUANT   (include   quantization   tables),  and  JPEGTABLESMODE_HUFF
              (include    Huffman     encoding     tables).      The     default     value     is

              Control the compression technique used by the Deflate codec.  Quality levels are in
              the range 1-9 with larger numbers yielding better compression at the cost  of  more
              computation.   The  default  quality  level  is  6  which  yields a good time-space

              Control the format of user data passed in to the PixarLog codec when  encoding  and
              passed out from when decoding.  Possible values are: PIXARLOGDATAFMT_8BIT for 8-bit
              unsigned pixels, PIXARLOGDATAFMT_8BITABGR for 8-bit unsigned  ABGR-ordered  pixels,
              PIXARLOGDATAFMT_11BITLOG       for      11-bit      log-encoded      raw      data,
              PIXARLOGDATAFMT_12BITPICIO for 12-bit PICIO-compatible data,  PIXARLOGDATAFMT_16BIT
              for 16-bit signed samples, and PIXARLOGDATAFMT_FLOAT for 32-bit IEEE floating point

              Control the compression technique used  by  the  PixarLog  codec.   This  value  is
              treated identically to TIFFTAG_ZIPQUALITY; see the above description.

              Control  the  format of client data passed in to the SGILog codec when encoding and
              passed out from when  decoding.   Possible  values  are:  SGILOGDATAFMT_FLTXYZ  for
              converting   between   LogLuv   and   32-bit   IEEE  floating  valued  XYZ  pixels,
              SGILOGDATAFMT_16BITLUV for 16-bit encoded Luv  pixels,  SGILOGDATAFMT_32BITRAW  and
              SGILOGDATAFMT_24BITRAW   for  no  conversion  of  data,  SGILOGDATAFMT_8BITRGB  for
              returning  8-bit  RGB  data  (valid  only  when  decoding   LogLuv-encoded   data),
              SGILOGDATAFMT_FLTY  for  converting  between LogL and 32-bit IEEE floating valued Y
              pixels, SGILOGDATAFMT_16BITL for 16-bit encoded L pixels, and SGILOGDATAFMT_8BITGRY
              for returning 8-bit greyscale data (valid only when decoding LogL-encoded data).


       All  error  messages  are directed through the TIFFError routine.  By default messages are
       directed to stderr in the form: module: message\n.  Warning messages are likewise directed
       through the TIFFWarning routine.


       fax2tiff(1), gif2tiff(1), pal2rgb(1), ppm2tiff(1), rgb2ycbcr(1), ras2tiff(1), raw2tiff(1),
       sgi2tiff(1), tiff2bw(1), tiffdither(1),  tiffdump(1),  tiffcp(1),  tiffcmp(1),  tiffgt(1),
       tiffinfo(1), tiffmedian(1), tiffsplit(1), tiffsv(1).

       Tag Image File Format Specification  Revision 6.0, an Aldus Technical Memorandum.

       The  Spirit  of TIFF Class F, an appendix to the TIFF 5.0 specification prepared by Cygnet

       Libtiff library home page:


       The library does not  support  multi-sample  images  where  some  samples  have  different

       The  library does not support random access to compressed data that is organized with more
       than one row per tile or strip.