ppmquantall(1)            UNIX System V(27 July 1990)            ppmquantall(1)


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

SYNOPSIS
      ppmquantall 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.

      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 environments.

AUTHOR
      Copyright (C) 1991 by Jef Poskanzer.





















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