ppmquantall (1)
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.
"colormap reduction"
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 ;
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
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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