ppmtopgm man page on IRIX

ppmtopgm man page on IRIX

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ppmtopgm(1)					      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" ren
       dering of the original image, as in a black and white pho
       tograph.	 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	automati
       cally.	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),ppm
       torgb3(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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