Amiga Unix — 68040 · 68060

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ppmtopgm(1X)

convert a portable pixmap into a portable graymap

From the original Amiga UNIX 2.1 manual. Some things it mentions may not be in this release.

ppmtopgm - convert a portable pixmap into a portable graymap

ppmtopgm [ppmfile]

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 there is no pgmtoppm converter because any ppm program can read pgm (and pbm) files automagically.

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.

ppm(5), pgm(5)

Copyright (C) 1989 by Jef Poskanzer.

Permission to use, copy, modify, and distribute this software and its documentation for any purpose and without fee is hereby granted, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation. This software is provided "as is" without express or implied warranty.

23 December 1988