pnmquant(1) - phpMan

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]  [-spreadbright-
       ness|-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 value.



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.

       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 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 continues 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(1)

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/pnmquant.html

netpbm documentation                      09 April 2013                   Pnmquant User Manual(0)

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