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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 "Ppmrelief User Manual" 0 "02 August 2014" "netpbm documentation"
+
+.SH NAME
+
+ppmrelief - compute a relief of a PPM image
+
+.UN synopsis
+.SH SYNOPSIS
+
+\fBppmrelief\fP
+
+[\fIppmfile\fP]
+
+.UN description
+.SH DESCRIPTION
+.PP
+This program is part of
+.BR "Netpbm" (1)\c
+\&.
+.PP
+\fBppmrelief\fP reads a PPM image as input, and writes a relief of
+that image as a PPM image as output.
+.PP
+The relief process is described in "Beyond Photography" by
+Holzmann, equation 3.19. It's a sort of edge-detection and is essentially
+a convolution with this matrix:
+
+.nf
+
+ | 1 0 0 |
+ | 0 0 0 |
+ | 0 0 -1 |
+
+
+.fi
+
+.UN options
+.SH OPTIONS
+.PP
+There are no command line options defined specifically
+for \fBppmrelief\fP, but it recognizes the options common to all
+programs based on libnetpbm (See
+.UR index.html#commonoptions
+ Common Options
+.UE
+\&.)
+
+.UN seealso
+.SH SEE ALSO
+.BR "pamshadedrelief" (1)\c
+\&,
+.BR "pgmbentley" (1)\c
+\&,
+.BR "pgmoil" (1)\c
+\&,
+.BR "ppm" (1)\c
+\&
+
+.UN author
+.SH AUTHOR
+
+Copyright (C) 1990 by Wilson Bent (\fIwhb@hoh-2.att.com\fP)
+.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/ppmrelief.html
+.PP \ No newline at end of file