man > pnmquantall(1)

Pnmquantall User Manual(1)             General Commands Manual            Pnmquantall User Manual(1)

NAME
       pnmquantall - run Pnmquant on a bunch of files all at once, so they share a common colormap


SYNOPSIS
       pnmquantall

       [-ext extension] ncolors netpbm_file...

       Note  that the usual syntax rules for Netpbm programs don't apply to this program.  For exam‐
       ple, you can't abbreviate -ext and you can't put it anywhere on the line you want.



DESCRIPTION
       This program is part of Netpbm(1).

       pnmquantall takes a bunch of Netpbm image files as input, chooses ncolors colors to best rep‐
       resent 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.

       The purpose is this: Let's say you've got a dozen PPMs that you want to display on the screen
       all at the same time.  Your screen can only display 256 different colors, but the PPMs have a
       total of a thousand or so different colors.  For a single image you solve this  problem  with
       pnmquant; pnmquantall solves it for multiple images.

       Note that another approach to this problem is to pre-select a set of colors and then use pnm‐
       remap to separately quantize each PPM to that set.)

       This  is  a rather simple program that runs pnmcolormap and pnmremap.  If you are considering
       using it in a program of any sophistication, you should probably just run those programs  di‐
       rectly.   Even  if  you are typing it, you may want to do the steps manually because it gives
       you access to the various options of pnmcolormap and pnmremap for doing the quantization dif‐
       ferently.



OPTIONS
       pnmquantall recognizes the following command line option:



       -ext extension
              Specify an extension for the output files.  By default the input files  are  overwrit‐
              ten.


       pnmquantall  does  not  recognize  the options common to all programs based on libnetpbm (See
        Common Options .)  However, the -version option works.


SEE ALSO
       pnmquant(1), pnmremap(1), pnmcolormap(1), pnm(1)

DOCUMENT SOURCE
       This manual page was generated by the Netpbm tool 'makeman' from  HTML  source.   The  master
       documentation is at

              http://netpbm.sourceforge.net/doc/pnmquantall.html

netpbm documentation                        05 March 2012                 Pnmquantall User Manual(1)