man > ppmquant(1)

Ppmquant User Manual(1)                General Commands Manual               Ppmquant User Manual(1)

NAME
       ppmquant - quantize the colors in a PPM image down to a specified number


SYNOPSIS
       ppmquant  [-floyd|-fs] ncolors [ppmfile] ppmquant [-floyd|-fs] [-nofloyd|-nofs] -mapfile map‐
       file [ppmfile]

       All options can be abbreviated to their shortest unique prefix.  You may use two hyphens  in‐
       stead  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).

       ppmquant is obsolete.  All it does now is invoke pnmquant or pnmremap.  You should use one of
       those programs in any new program, or if you are modifying an old program, and  your  program
       does  not  have to work with a version of Netpbm before 9.21 (January 2001).  ppmquant exists
       only for name compatibility.

       pnmquant is fully backward compatible with ppmquant without the -mapfile option; pnmremap  is
       fully backward compatible with ppmquant with the -mapfile option.

       Except  with  differences  suggested by the syntax synopsis above, ppmquant's function is the
       same as pnmquant and pnmremap.

       Before Netpbm 10.19 (November 2003), ppmquant was a  completely  separate  program  from  pn‐
       mquant, and was a bona fide PPM program.  That means if you gave it a PGM or PBM image as in‐
       put,  it  would process it as if it were PPM and generate a PPM output.  Now, since it is re‐
       ally a PNM program, it processes PBM and PGM inputs as what they are and  produces  the  same
       kind of output.

       Note:  The reason ppmquant was changed in Netpbm 10.19 is that for some time before that, pp‐
       mquant had a serious bug that would have been difficult to fix -- it chose  the  wrong  color
       set.  Maintaining two versions of the same code did not make sense.


SEE ALSO
       pnmquant(1), pnmremap(1), pnmcolormap(1), pamseq(1), ppm(1)


AUTHOR
       Copyright (C) 1989, 1991 by Jef Poskanzer.

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/ppmquant.html

netpbm documentation                       22 October 2003                   Ppmquant User Manual(1)