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ppmtopgm(1) AMIGA (23 December 1988) ppmtopgm(1)
NAME
ppmtopgm - convert a portable pixmap into a portable graymap
SYNOPSIS
ppmtopgm [ppmfile]
DESCRIPTION
Reads a portable pixmap as input. Produces a portable
graymap as output. 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 automagically.
pgmtoppm is for colorizing a pgm file. Also, see ppmtorgb3
for a different way of converting color to gray.
QUOTE
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.
SEE ALSO
pgmtoppm(1), ppmtorgb3(1), rgb3toppm(1), ppm(5), pgm(5)
AUTHOR
Copyright (C) 1989 by Jef Poskanzer.
Page 1 (printed 10/19/91)