PPMTORGB3

NAME

      ppmtorgb3 - separate a portable pixmap into three portable graymaps

SYNOPSIS

      ppmtorgb3 [ppmfile]

DESCRIPTION

      Reads a portable pixmap as input.  Writes three portable graymaps as
      output, one each for red, green, and blue.
      The output filenames are constructed by taking the input filename,
      stripping off any extension, and appending ".red", ".grn", and ".blu".
      For example, separating lenna.ppm would result in lenna.red,
      lenna.grn, and lenna.blu.  If the input comes from stdin, the names
      are noname.red, noname.grn, and noname.blu.

DEMONSTRATION

      Let a.ppm be a portable pixmap.
      The following command will generate three greymaps (for red, green 
      and blue):
	ppmmerge ppmtorgb3 a.ppm
      The greymaps generated are a.red, a.grn and a.blu.	

BEFORE

AFTER

red:

green:

blue:

SEE ALSO

      rgb3toppm(1), ppmtopgm(1), pgmtoppm(1), ppm(5), pgm(5)

AUTHOR

      Copyright (C) 1991 by Jef Poskanzer.