ppmquantall(1)

NAME

   ppmquantall  -  run  ppmquant  on a bunch of files all at once, so they
   share a common colormap

SYNOPSIS

   ppmquantall [-ext extension] ncolors ppmfile ...

DESCRIPTION

   Takes a bunch of portable pixmap as input.  Chooses ncolors  colors  to
   best  represent  all of the images, maps the existing colors to the new
   ones, and overwrites the input files with the new quantized versions.

   If you don't want to overwrite your input files, use the  -ext  option.
   The  output  files  are  then named the same as the input files, plus a
   period and the extension text you specify.

   Verbose explanation: Let's say you've got a dozen pixmaps that you want
   to  display  on  the screen all at the same time.  Your screen can only
   display 256 different colors,  but  the  pixmaps  have  a  total  of  a
   thousand  or  so  different colors.  For a single pixmap you solve this
   problem with ppmquant; this script solves it for multiple pixmaps.  All
   it  does is concatenate them together into one big pixmap, run ppmquant
   on that, and then split it up into little pixmaps again.

   (Note that another way to solve this problem is to pre-select a set  of
   colors  and then use ppmquant's -map option to separately quantize each
   pixmap to that set.)

SEE ALSO

   ppmquant(1), ppm(5)

AUTHOR

   Copyright (C) 1991 by Jef Poskanzer.

                             27 July 1990                   ppmquantall(1)

---

Free and Open Source Software