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  ncol­
       ors  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)


BUGS

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


AUTHOR

       Copyright (C) 1991 by Jef Poskanzer.


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