pgmtoybm - convert a portable bitmap into a Bennet Yee
Reads a portable bitmap as input. Produces as output a file
acceptable to the face and xbm programs by
Bennet Yee (email@example.com).
ybmtopbm(1), pbm(5), face(1)?, face(5)?, xbm(1)?
Copyright (C) 1991 by Jamie Zawinski and Jef