ppmquantall

ppmquantall(1)              General Commands Manual             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 pe-
       riod 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  thou-
       sand  or so different colors.  For a single pixmap you solve this prob-
       lem 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)