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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 "Pgmtopbm User Manual" 0 "17 July 2020" "netpbm documentation"
+
+.SH NAME
+
+pgmtopbm - convert a PGM image to PBM
+
+.UN synopsis
+.SH SYNOPSIS
+
+\fBpgmtopbm\fP
+
+[\fB-floyd\fP | \fB-fs\fP | \fB-threshold\fP
+| \fB-hilbert\fP
+| \fB-dither8\fP | \fB-d8\fP | \fB-cluster3\fP
+| \fB-c3\fP | \fB-cluster4\fP | \fB-c4\fP
+| \fB-cluster8\fP | \fB-c8\fP]
+
+[\fB-value\fP \fIval\fP]
+
+[\fB-clump\fP \fIsize\fP]
+
+[\fB-randomseed\fP \fIinteger\fP]
+
+[\fIpgmfile\fP]
+
+.UN description
+.SH DESCRIPTION
+.PP
+This program is part of
+.BR "Netpbm" (1)\c
+\&.
+.PP
+This program is almost entirely obsolete since Netpbm 10.23 (July
+2004).  Use
+.BR "\fBpamditherbw\fP" (1)\c
+\& to do
+what this program used to do.
+.PP
+\fBpgmtopbm\fP never was the simple converter it appeared to be.
+It was a dithering program.  Unfortunately, it didn't do the dithering
+properly because it treated the PGM input samples as if they were
+directly proportional to light intensity, but they are actually
+gamma-adjusted.
+.PP
+\fBpamditherbw\fP is backward compatible with \fBpgmtopbm\fP
+except that it 
+
+.IP \(bu
+does the correct gamma adjustments.
+.IP \(bu
+produces PAM output instead of PBM.  (Modern Netpbm programs that
+accept PBM input also accept PAM input, but if you need actual PBM,
+you can use \fBpamtopnm\fP with \fBpamditherbw\fP).
+
+So use the manual for \fBpamditherbw\fP for \fBpgmtopbm\fP, except
+ignore anything that says it was added after Netpbm Release 10.23
+and ignore any options that are not shown in the synopsis above.
+.PP
+Although \fBpgmtopbm\fP is mostly obsolete, the simple threshold
+method (specified by \fB-threshold\fP) is an exception.  Unlike the
+other conversion methods, gamma-adjustment is not an issue with
+simple thresholding and \fBpgmtopbm\fP can produce PBM output
+directly.  Note that even in this basic mode of operation
+\fBpgmtopbm\fP may produce output which is slightly different from
+what \fBpamditherbw\fP does because of differences in internal
+calculation.
+.PP
+If you just want to convert a PGM image with maxval 1 to PBM,
+use
+.BR "\fBpamtopnm\fP" (1)\c
+\&.
+
+.UN seealso
+.SH SEE ALSO
+.BR "pamditherbw" (1)\c
+\&,
+.BR "pamtopnm" (1)\c
+\&,
+.BR "pbmtopgm" (1)\c
+\&,
+.BR "pamthreshold" (1)\c
+\&,
+.BR "pbmreduce" (1)\c
+\&,
+.BR "pgm" (1)\c
+\&,
+.BR "pbm" (1)\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/pgmtopbm.html
+.PP
+\ No newline at end of file