GIFTRANS(l)                                                        GIFTRANS(l)


       giftrans  -  transform gif from gif87 to gif89, making one color trans-


       giftrans [options] [-o filename] filename


       giftrans converts any GIF file into a GIF89a.  Allows for  setting  the
       transparent  or  background  color, changing colors, adding or removing
       comments. Also code to analyze GIF contents.


       -h     Print short help on stdout.

       -t     Specify the transparent color

       -T     Index of the transparent color is the background color index

       -B     Specify the transparent color’s new value

       -b     Specify the background color

       -g     Change a color in the global color table

       -c     Add a comment

       -C     Remove old comment

       -l     Only list the color table

       -L     Verbose output of GIFs contents

       -V     Verbose output while converting

       -o     Redirect stdout to a file

       -e     Redirect stderr to a file

       Colors may be specified as index, as rgb.txt entry or  in  the  #rrggbb


       To convert the white background of a gif file to transparent, use

            giftrans -t #ffffff file.gif > transparentfile.gif


       This program has been tested on a HP9000/720 with HP-UX A.08.07 In this
       environment, neither lint -u nor gcc -Wall produce  any  messages.   If
       you  encounter  any  errors  or  need to make any changes to port it to
       another platform, please contact me.

       Known bugs:

              -B flag won’t work if there’s an Extension  between  the  Global
              Color  Table and the Image Descriptor (or Graphic Control Exten-
              sion). If -V has been specified, a Warning Message will be  dis-
              played.  Will be fixed in 2.0

              Always outputs GIF89a. Shouldn’t do this if version is newer.

              -D  option may output changed data instead of original data, use
              with caution, best only with then -L option.


       Copyright (c) 24.2.94 by Andreas Ley <>

       Permission to use, copy, modify, and distribute this software  for  any
       purpose  and  without  fee  is  hereby granted, provided that the above
       copyright notice appears in all copies. This software is  provided  "as
       is" and without any express or implied warranties.


       Version 1.11 - 21.7.94
              Moved  Plain  Text  Extension to the Extensions section where it
              Accept Unknown Extension Labels
              Incorporated MS-DOS port by (Enzo Michelangeli)
              Added -o and -e options to redirect stdout and stderr
              Added -D debug flag

       Version 1.10.2 - 22.6.94
              Support for -DRGBTXT flag

       Version 1.10.1 - 21.6.94
              Different rgb.txt file FreeBSD/386BSD

       Version 1.10 - 19.6.94
              Added option to change a color in the global color table
              Added option to change the color for the transparent color index

       Version 1.9.1 - 7.6.94
              Different rgb.txt files for X11 and Open Windows

       Version 1.9 - 1.6.94
              Fixed a bug which caused color names to be rejected.

       Version 1.8 - 30.5.94
              Accept #rrggbb style arguments.
              Do nothing if rgb-color not found in GIF.

       Version 1.7 - 16.5.94
              Added -l option to only list the color table.
              Added  -L  option  for  verbose  output  without creating a gif.
              Added -b option to change the background color index.
              Display all matching color names for color table entries.
              Fixed a bug which caused bad color names if rgb.txt starts  with
              Doesn’t use strdup anymore.
              Fixed =& bug on dec machines.

       Version 1.6 - 5.4.94
              Added color names recognition.

       Version 1.5 - 15.3.94
              Added basic verbose output to analyze GIFs.

       Version 1.4 - 8.3.94
              Fixed off-by-one bug in Local Color table code.
              Added option to add or remove a comment.
              Transparency is no longer the default.

       This man file made 9.8 from documentation in the program source code by
       Kai Nordlund (


       Thanx for bug reports, ideas and fixes to

     (Patrick Atoon)

     (Wes Barris)

     (Patrick M. Fitzgerald)

     (frans van hoesel)

     (Dan Boardman)

     (Ken Weiss)

     (Chuck Musciano)

     (Torsten Heycke)

     (Colin Law)

     (Joseph C. Walker)

     (Bjorn Borud)

     (CJS Vance)

     (Peder Langlo)

     (Ian Rutson)

     (Nicolas Pioch)

              john@charles.CS.UNLV.EDU (John Kilburg)

     (Enzo Michelangeli)


       Original distribution site is

       To compile for MS-DOS, you need getopt:

       MS-DOS executable can be found at

       A template rgb.txt for use with the MS-DOS version can be found at

       Additional info can be found on


       xv(1), giftoppm(1), ppmtogif(1)

                                     local                         GIFTRANS(l)

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