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Pnmquant User Manual(0) Pnmquant User Manual(0)
NAME
pnmquant - quantize the colors in a Netpbm image to a smaller set
SYNOPSIS
pnmquant [-center|-meancolor|-meanpixel] [-floyd|-fs] [-nofloyd|-nofs]
[-spreadbrightness|-spreadluminosity] ncolors [pnmfile]
DESCRIPTION
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.
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
value.
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
pnmquant.
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.
Here is an example of the relationship between the programs:
This:
$ pnmquant 256 myimage.pnm >/tmp/colormap.pnm >myimage256.pnm
does essentially this:
$ pnmcolormap 256 myimage.pnm >/tmp/colormap.pnm
$ pnmremap -mapfile=/tmp/colormap.pnm myimage.pnm >myimage256.pnm
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
pnmquant.
SEE ALSO
pnmcolormap(1) , pnmremap(1) , ppmquantall(1) , pamdepth(1) ,
ppmdither(1) , ppmquant(1) , pnm(5)
netpbm documentation 09 April 2013 Pnmquant User Manual(0)
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