.TH ppmtopgm 1 "23 December 1988"
.SH NAME
ppmtopgm - convert a portable pixmap into a portable graymap
.SH SYNOPSIS
ppmtopgm [ppmfile]
.SH DESCRIPTION
Reads a portable pixmap as input.
Produces a portable graymap as output.
The quantization formula used is .299 r + .587 g + .114 b.
.PP
Note that there is no pgmtoppm converter because any ppm program can
read pgm (and pbm) files automagically.
.SH QUOTE
.nf
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.
.fi
.SH "SEE ALSO"
ppm(5), pgm(5)
.SH AUTHOR
Copyright (C) 1989 by Jef Poskanzer.

Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted, provided
that the above copyright notice appear in all copies and that both that
copyright notice and this permission notice appear in supporting
documentation.  This software is provided "as is" without express or
implied warranty.