ppmquantall(1) - man - phpMan

ppmquantall(1)                         General Commands Manual                        ppmquantall(1)



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 con‐
       catenate 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)