GIFTRANS(1)						      General Commands Manual						       GIFTRANS(1)

NAME

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

SYNOPSIS

       giftrans [options] [-o filename] filename

DESCRIPTION

       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.

OPTIONS

       -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 form. Of course, beware that shells will often consider the #  charac-
       ter to start a comment and so you may have to escape it!

EXAMPLE

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

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

BUGS

       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  Extension).
	      If -V has been specified, a Warning Message will be displayed.  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

       Copyright (c) 24.2.94 by Andreas Ley <ley@rz.uni-karlsruhe.de>

       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 HISTORY

       Version 1.11 - 21.7.94
	      Moved Plain Text Extension to the Extensions section where it belongs
	      Accept Unknown Extension Labels
	      Incorporated MS-DOS port by enzo@hk.net (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 whitespace.
	      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 (knordlun@fltxa.helsinki.fi).

THANKS

       Thanx for bug reports, ideas and fixes to

	      patricka@cs.kun.nl (Patrick Atoon)

	      wes@msc.edu (Wes Barris)

	      pmfitzge@ingr.com (Patrick M. Fitzgerald)

	      hoesel@chem.rug.nl (frans van hoesel)

	      boardman@jerry.sal.wisc.edu (Dan Boardman)

	      krweiss@chip.ucdavis.edu (Ken Weiss)

	      chuck@trantor.harris-atd.com (Chuck Musciano)

	      heycke@camis.stanford.edu (Torsten Heycke)

	      claw@spacsun.rice.edu (Colin Law)

	      jwalker@eos.ncsu.edu (Joseph C. Walker)

	      Bjorn.Borud@alkymi.unit.no (Bjorn Borud)

	      Christopher.Vance@adfa.oz.au (CJS Vance)

	      pederl@norway.hp.com (Peder Langlo)

	      I.Rutson@bradford.ac.uk (Ian Rutson)

	      Nicolas.Pioch@enst.fr (Nicolas Pioch)

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

	      enzo@hk.net (Enzo Michelangeli)

SEE ALSO

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

																       GIFTRANS(1)