NAME¶
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
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.
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)
AUTHOR¶
Copyright (C) 1991 by Jef Poskanzer.