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 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 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
       .)  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)