CentOS 7.0 - man page for ppmtopgm (centos section 0)
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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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