1Pnmquant User Manual(0)                                Pnmquant User Manual(0)
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NAME

6       pnmquant - quantize the colors in a Netpbm image to a smaller set
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SYNOPSIS

10       pnmquant  [-center|-meancolor|-meanpixel] [-floyd|-fs] [-nofloyd|-nofs]
11       [-spreadbrightness|-spreadluminosity] ncolors [pnmfile]
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13       All options can be abbreviated to their shortest  unique  prefix.   You
14       may use two hyphens instead of one to designate an option.  You may use
15       either white space or equals signs  between  an  option  name  and  its
16       value.
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DESCRIPTION

21       This program is part of Netpbm(1).
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23       pnmquant reads a PNM image as input.  It chooses ncolors colors to best
24       represent the image, maps the existing colors  to  the  new  ones,  and
25       writes a PNM image as output.
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27       This program is simply a combination of pnmcolormap and pnmremap, where
28       the colors of the input are remapped using a color map which is  gener‐
29       ated  from  the  colors  in that same input.  The options have the same
30       meaning as in those programs.  See their  documentation  to  understand
31       pnmquant.
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33       It is much faster to call pnmcolormap and pnmremap directly than to run
34       pnmquant.  You save the overhead of the Perl interpreter  and  creating
35       two extra processes.  pnmquant is just a convenience.
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37       Here is an example of the relationship between the programs:
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39       This:
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41           $ pnmquant 256 myimage.pnm >/tmp/colormap.pnm >myimage256.pnm
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43       does essentially this:
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45           $ pnmcolormap 256 myimage.pnm >/tmp/colormap.pnm
46           $ pnmremap -mapfile=/tmp/colormap.pnm myimage.pnm >myimage256.pnm
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48       pnmquant did not exist before Netpbm 9.21 (January 2001).  Before that,
49       ppmquant did the same thing, but only on PPM images.  ppmquant  contin‐
50       ues  to  exist,  but  is  only  a front end (for name compatibility) to
51       pnmquant.
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SEE ALSO

55       pnmcolormap(1), pnmremap(1), ppmquantall(1), pamdepth(1), ppmdither(1),
56       ppmquant(1), pnm(1)
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DOCUMENT SOURCE

59       This  manual  page was generated by the Netpbm tool 'makeman' from HTML
60       source.  The master documentation is at
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62              http://netpbm.sourceforge.net/doc/pnmquant.html
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64netpbm documentation             09 April 2013         Pnmquant User Manual(0)
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