Pnmquant User Manual(0) Pnmquant User Manual(0)
pnmquant - quantize the colors in a Netpbm image to a smaller set
pnmquant [-center|-meancolor|-meanpixel] [-floyd|-fs] [-nofloyd|-nofs]
[-spreadbrightness|-spreadluminosity] ncolors [pnmfile]
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 part of Netpbm(1).
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.
This program is simply a combination of pnmcolormap and pnmremap, where
the colors of the input are remapped using a color map which is gener-
ated from the colors in that same input. The options have the same
meaning as in those programs. See their documentation to understand
It is much faster to call pnmcolormap and pnmremap directly than to run
pnmquant. You save the overhead of the Perl interpreter and creating
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 contin-
ues to exist, but is only a front end (for name compatibility) to
pnmcolormap(1), pnmremap(1), ppmquantall(1), pnmdepth(1), ppmdither(1),
netpbm documentation 22 October 2003 Pnmquant User Manual(0)
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