ppmquantall



Ppmquantall User Manual(0)                          Ppmquantall User Manual(0)




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

       This program is part of Netpbm(1).

       ppmquantall takes a bunch of PPM images as input, chooses ncolors  col-
       ors  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 PPMs that you want to
       display on the screen all at the same time.  Your screen can only  dis-
       play  256  different colors, but the PPMs have a total of a thousand or
       so different colors.  For a single PPM  you  solve  this  problem  with
       pnmquant; ppmquantall solves it for multiple PPMs.  All it does is con-
       catenate them together into one big PPM, run pnmquant on that, and then
       split it up into little PPMs again.

       (Note  that another way to solve this problem is to pre-select a set of
       colors and then use pnmremap to separately quantize each  PPM  to  that
       set.)



SEE ALSO

       pnmquant(1), pnmremap(1), pnmcolormap(1), ppm(1)



AUTHOR

       Copyright (C) 1991 by Jef Poskanzer.



netpbm documentation             27 July 1990       Ppmquantall User Manual(0)

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