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+.\" This man page was generated by the Netpbm tool 'makeman' from HTML source.
+.\" Do not hand-hack it!  If you have bug fixes or improvements, please find
+.\" the corresponding HTML page on the Netpbm website, generate a patch
+.\" against that, and send it to the Netpbm maintainer.
+.TH "Ppmtopgm User Manual" 0 "625 June 2017" "netpbm documentation"
+
+.SH NAME
+
+ppmtopgm - convert a PPM image to a PGM image
+
+.UN synopsis
+.SH SYNOPSIS
+
+\fBppmtopgm\fP
+
+[\fIppmfile\fP]
+
+.UN description
+.SH DESCRIPTION
+.PP
+This program is part of
+.BR "Netpbm" (1)\c
+\&.
+.PP
+\fBppmtopgm\fP reads a PPM as input and produces a PGM as output.
+The output is a "black and white" rendering of the original
+image, as in a black and white photograph.  The quantization formula
+\fBppmtopgm\fP uses is y = .299 r + .587 g + .114 b.
+.PP
+The dimensions and maxval of the output are the same as the input.
+Note that with only one color plane, there are far fewer brightnesses
+that can be represented with the same maxval than with three color
+planes, so you may want to increase the maxval of the input with
+\fBpamdepth\fP before giving it to \fBppmtopgm\fP to avoid loss of
+information.  For example, with a maxval of 1, there are 8 brightnesses that
+are possible in a PPM (though some of them are barely distinguishable), but
+only 2 brightness levels possible in a PGM.
+.PP
+Note that although there is a \fBpgmtoppm\fP program, it is not
+necessary for simple conversions from pgm to ppm , because any ppm
+program can read pgm (and pbm ) files automatically.  \fBpgmtoppm\fP
+is for colorizing a pgm file.  Also, see \fBppmtorgb3\fP for a
+different way of converting color to gray.  And \fBppmdist\fP
+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.
+
+.UN quote
+.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
+
+.UN seealso
+.SH SEE ALSO
+.BR "pgmtoppm" (1)\c
+\&,
+.BR "ppmtorgb3" (1)\c
+\&,
+.BR "rgb3toppm" (1)\c
+\&,
+.BR "ppmdist" (1)\c
+\&,
+.BR "ppm" (5)\c
+\&,
+.BR "pgm" (5)\c
+\&
+
+.UN author
+.SH AUTHOR
+
+Copyright (C) 1989 by Jef Poskanzer.
+.SH DOCUMENT SOURCE
+This manual page was generated by the Netpbm tool 'makeman' from HTML
+source.  The master documentation is at
+.IP
+.B http://netpbm.sourceforge.net/doc/ppmtopgm.html
+.PP
+\ No newline at end of file