Ppmquant User Manual(1) General Commands Manual Ppmquant User Manual(1)
NAME
ppmquant - quantize the colors in a PPM image down to a specified number
SYNOPSIS
ppmquant [-floyd|-fs] ncolors [ppmfile] ppmquant [-floyd|-fs]
[-nofloyd|-nofs] -mapfile mapfile [ppmfile]
All options can be abbreviated to their shortest unique prefix. You may
use two hyphens instead of one to designate an option. You may use ei-
ther white space or equals signs between an option name and its value.
DESCRIPTION
This program is part of Netpbm(1).
ppmquant is obsolete. All it does now is invoke pnmquant or pnmremap.
You should use one of those programs in any new program, or if you are
modifying an old program, and your program does not have to work with a
version of Netpbm before 9.21 (January 2001). ppmquant exists only for
name compatibility.
pnmquant is fully backward compatible with ppmquant without the -mapfile
option; pnmremap is fully backward compatible with ppmquant with the
-mapfile option.
Except with differences suggested by the syntax synopsis above, pp-
mquant's function is the same as pnmquant and pnmremap.
Before Netpbm 10.19 (November 2003), ppmquant was a completely separate
program from pnmquant, and was a bona fide PPM program. That means if
you gave it a PGM or PBM image as input, it would process it as if it
were PPM and generate a PPM output. Now, since it is really a PNM pro-
gram, it processes PBM and PGM inputs as what they are and produces the
same kind of output.
Note: The reason ppmquant was changed in Netpbm 10.19 is that for some
time before that, ppmquant had a serious bug that would have been diffi-
cult to fix -- it chose the wrong color set. Maintaining two versions
of the same code did not make sense.
SEE ALSO
pnmquant(1), pnmremap(1), pnmcolormap(1), pamseq(1), ppm(1)
AUTHOR
Copyright (C) 1989, 1991 by Jef Poskanzer.
DOCUMENT SOURCE
This manual page was generated by the Netpbm tool 'makeman' from HTML
source. The master documentation is at
http://netpbm.sourceforge.net/doc/ppmquant.html
netpbm documentation 22 October 2003 Ppmquant User Manual(1)
Generated by dwww version 1.16 on Mon Dec 15 23:42:30 CET 2025.