Manual: pnmquantall

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 example, 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 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.

       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 pnmremap to separately quan‐
       tize 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 directly.  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 differently.

OPTIONS
       pnmquantall recognizes the following command line option:

       -ext extension
	      Specify an extension for the output files.  By default the input files are overwritten.

       pnmquantall  does  not  recognize the options common to all programs based on libnetpbm (See  Common Options .)	How‐
       ever, 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)