ppmtogif - convert a portable pixmap into a GIF file
ppmtogif [<ppmfile>]
Reads a portable pixmap as input. Produces a GIF file as output.
giftoppm(1), ppm(5)
Based on GIFENCOD by David Rowley <mgardi@watdcsu.waterloo.edu>. Lempel-Zim compression based on "compress". Copyright (C) 1989 by Jef Poskanzer. Permission to use, copy, modify, and distribute this software and its documentation for any purpose and without fee is hereby granted, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation. This software is provided "as is" without express or implied warranty.