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Ppmtopgm User Manual(0) 						  Ppmtopgm User Manual(0)

       ppmtopgm - convert a PPM image to a PGM image



       This program is part of Netpbm(1)

       ppmtopgm  reads	a  PPM as input and produces a PGM as output.  The output is a 'black and
       white' rendering of the original image, as in a black and white photograph.  The quantiza-
       tion formula ppmtopgm uses is g = .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.

       pgmtoppm(1) , ppmtorgb3(1) , rgb3toppm(1) , ppmdist(1) , ppm(1) , pgm(1)

       Copyright (C) 1989 by Jef Poskanzer.

netpbm documentation			  10 April 2000 		  Ppmtopgm User Manual(0)
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