ppmquantall man page on DigitalUNIX

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ppmquantall(1)							ppmquantall(1)

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

       ppmquantall ncolors ppmfile ...

       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.

       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.)

       ppmquant(1), ppm(5)

       It's a csh script.  Csh scripts are not portable to System V.   Scripts
       in general are not portable to non-Unix environments.

       Copyright (C) 1991 by Jef Poskanzer.

				 27 July 1990			ppmquantall(1)

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