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 ⟨index.html#commonoptions⟩ .)  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