xenial (1) ppmquantall.1.gz

Provided by: netpbm_10.0-15.3_amd64 bug

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.

                                                  27 July 1990                                    ppmquantall(1)