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..