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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.3//EN">
<html><head><title>Ppmrelief User Manual</title></head>
<body>
<h1>ppmrelief</h1>
Updated: 02 August 2014
<br>
<a href="#index">Table Of Contents</a>
<h2>NAME</h2>
ppmrelief - compute a relief of a PPM image
<h2 id="synopsis">SYNOPSIS</h2>
<b>ppmrelief</b>
[<i>ppmfile</i>]
<h2 id="description">DESCRIPTION</h2>
<p>This program is part of <a href="index.html">Netpbm</a>.
<p><b>ppmrelief</b> reads a PPM image as input, and writes a relief of
that image as a PPM image as output.
<p>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:
<pre>
<span style="font-family: monospace">
| 1 0 0 |
| 0 0 0 |
| 0 0 -1 |
</span>
</pre>
<h2 id="options">OPTIONS</h2>
<p>There are no command line options defined specifically
for <b>ppmrelief</b>, but it recognizes the options common to all
programs based on libnetpbm (See <a href="index.html#commonoptions">
Common Options</a>.)
<h2 id="seealso">SEE ALSO</h2>
<a href="pamshadedrelief.html">pamshadedrelief</a>,
<a href="pgmbentley.html">pgmbentley</a>,
<a href="pgmoil.html">pgmoil</a>,
<a href="ppm.html">ppm</a>
<h2 id="author">AUTHOR</h2>
Copyright (C) 1990 by Wilson Bent (<a
href="mailto:whb@hoh-2.att.com">whb@hoh-2.att.com</a>)
<hr>
<h2 id="index">Table Of Contents</h2>
<ul>
<li><a href="#synopsis">SYNOPSIS</a>
<li><a href="#description">DESCRIPTION</a>
<li><a href="#options">OPTIONS</a>
<li><a href="#seealso">SEE ALSO</a>
<li><a href="#author">AUTHOR</a>
</ul>
</body>
</html>
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