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ppmtopgm.1
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1996-11-18
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.TH ppmtopgm 1 "23 December 1988"
.IX ppmtopgm
.SH NAME
ppmtopgm - convert a portable pixmap into a portable graymap
.SH SYNOPSIS
.B ppmtopgm
.RI [ 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 although there is a
.I pgmtoppm
program, it is not necessary
for simple conversions from
.I pgm
to
.IR ppm ,
because any ppm program can
read
.I pgm
(and
.I pbm
) files automagically.
.I pgmtoppm
is for colorizing a
.I pgm
file. Also, see
.I ppmtorgb3
.IX ppmtorgb3
for a different way of converting color to gray.
.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"
pgmtoppm(1), ppmtorgb3(1), rgb3toppm(1), 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.