GNU/Linux man pages
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Expressions régulières,
Syntaxe et mise en oeuvre :
GNU/Linux |
RedHat 6.2(Zoot) |
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ppmtopgm(1) |
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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 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.
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), ppm(5), pgm(5)
Copyright (C) 1989 by Jef Poskanzer.
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ppmtopgm(1) | |