pnmquant [-center|-meancolor|-meanpixel] [-floyd|-fs] [-nofloyd|-nofs]
[-spreadbrightness|-spreadluminosity] ncolors [pnmfile]
This program is part of Netpbm.
pnmquant reads a PNM image as input. It chooses ncolors colors to
best represent the image, maps the existing colors to the new ones,
and writes a PNM image as output.
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 either white space or equals signs between an option name and its
This program is simply a combination of pnmcolormap and pnmremap,
where the colors of the input are remapped using a color map which is
generated from the colors in that same input. The options have the
same meaning as in those programs. See their documentation to under-
It is much faster to call pnmcolormap and pnmremap directly than to
run pnmquant. You save the overhead of the Perl interpreter and cre-
ating two extra processes. pnmquant is just a convenience.
pnmquant did not exist before Netpbm 9.21 (January 2001). Before
that, ppmquant did the same thing, but only on PPM images. ppmquant
continues to exist, but is only a front end (for name compatibility)
pnmcolormap, pnmremap, ppmquantall, pamdepth,
ppmdither, ppmquant, pnm
netpbm documentation 22 October 2003 Pnmquant User Manual(0)