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ppmtorgb3(1) [sunos man page]

ppmtorgb3(1)						      General Commands Manual						      ppmtorgb3(1)

NAME
ppmtorgb3 - separate a portable pixmap into three portable graymaps SYNOPSIS
ppmtorgb3 [ppmfile] DESCRIPTION
Reads a portable pixmap as input. Writes three portable graymaps as output, one each for red, green, and blue. The output filenames are constructed by taking the input filename, stripping off any extension, and appending ".red", ".grn", and ".blu". For example, separating lenna.ppm would result in lenna.red, lenna.grn, and lenna.blu. If the input comes from stdin, the names are no- name.red, noname.grn, and noname.blu. SEE ALSO
rgb3toppm(1), ppmtopgm(1), pgmtoppm(1), ppm(5), pgm(5) AUTHOR
Copyright (C) 1991 by Jef Poskanzer. 10 January 1991 ppmtorgb3(1)

Check Out this Related Man Page

ppmtopgm(1)                                                   General Commands Manual                                                  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 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
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),ppmdist(1),ppm(5),pgm(5) AUTHOR
Copyright (C) 1989 by Jef Poskanzer. 10 April 2000 ppmtopgm(1)

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