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RedHat 9 (Linux i386) - man page for ppmtopgm (redhat section 1)

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ppmtopgm(1)									      ppmtopgm(1)

       ppmtopgm - convert a portable pixmap into a portable graymap

       ppmtopgm [ppmfile]

       Reads a portable pixmap as input.  Produces a portable graymap as output.  The output is a
       "black and white" rendering of the original image, as in a  black  and  white  photograph.
       The quantization formula used is .299 r + .587 g + .114 b.

       Note that although there is a pgmtoppm program, it is not necessary for simple conversions
       from pgm to ppm , because any ppm program can read pgm (and  pbm  )  files  automatically.
       pgmtoppm  is  for  colorizing a pgm file.  Also, see ppmtorgb3 for a different way of con-
       verting color to gray.  And ppmdist generates a grayscale image from a color image, but in
       a  way that makes it easy to differentiate the original colors, not necessarily a way that
       looks like a black and white photograph.

       Cold-hearted orb that rules the night
       Removes the colors from our sight
       Red is gray, and yellow white
       But we decide which is right
       And which is a quantization error.


       Copyright (C) 1989 by Jef Poskanzer.

					  10 April 2000 			      ppmtopgm(1)
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