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gifovly
This program takes a multi-image GIF file and generates a single GIF
consisting of all the images overlayed.  Each image's screen position
is used.  Thus, you can use this together with gifpos and gifasm to
paste together images.
Usage:
gifovly [-s TransparentColor] [-h]
The GIF to be operated is read in from stdin.  The result GIF is written to
stdout.
Memory required:
Proportional to the size of the input file.
Options:
-  [-t num]
-  If this index is given, any pixel in images after the first that
   has this value is not copied.
 
-  [-h]
-  Print one line of command line help, similar to Usage above..
 
Author:
Eric S. Raymond <esr@snark.thyrsus.com>
Eric S. Raymond <esr@snark.thyrsus.com>