Codex

ppmtopgm

Section: User Commands (1)

Updated: 10 April 2000

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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 output is a "black and white" rendering of the original image, as in a black and white photograph. 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 automatically. pgmtoppm is for colorizing a pgm file. Also, see ppmtorgb3 ]] for a different way of converting 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.

QUOTE

SEE ALSO

pgmtoppm?(1),ppmtorgb3?(1),rgb3toppm?(1),ppmdist?(1),ppm?(5),pgm?(5)

AUTHOR

Copyright (C) 1989 by Jef Poskanzer.


Index

NAME

SYNOPSIS

DESCRIPTION

QUOTE

SEE ALSO

AUTHOR


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