ppmtomap - extract all colors from a portable pixmap
SYNOPSIS
ppmtomap [-sort] [-square] [ppmfile]
DESCRIPTION
Reads a portable pixmap as input. Produces a portable
pixmap as output, representing a color map of the input
file. All N different colors found are put in an Nx1
portable pixmap. This color map file can be used as a
mapfile for ppmquant or ppmtogif.
OPTIONS
-sort Produces a portable pixmap with the colors in some
sorted order.
-square
Produces a (more or less) square output file,
instead of putting all colors on the top row.
All flags can be abbreviated to their shortest unique pre
fix.
WARNING
If you want to use the output file as a mapfile for ppm
togif, you first have to do a ppmquant 256, since ppmtomap
is not limited to 256 colors (but to 65536).
SEE ALSO
ppmtogif(1), ppmquant(1), ppm(5)
AUTHOR
Marcel Wijkstra (wijkstra@fwi.uva.nl).
Copyright (C) 1989 by Jef Poskanzer.
Man(1) output converted with
man2html