rgb3toppm(1) [mojave man page]

rgb3toppm(1)						      General Commands Manual						      rgb3toppm(1)

NAME

       rgb3toppm - combine three portable graymaps into one portable pixmap

SYNOPSIS

       rgb3toppm redpgmfile greenpgmfile bluepgmfile

DESCRIPTION

       Reads three portable graymaps as input.	Combines them and produces one portable pixmap as output.

SEE ALSO

       ppmtorgb3(1), pgmtoppm(1), ppmtopgm(1), ppm(5), pgm(5)

AUTHOR

       Copyright (C) 1991 by Jef Poskanzer.

								 15 February 1990						      rgb3toppm(1)

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)