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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