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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.3//EN">
<html><head><title>Pnminvert User Manual</title></head>
<body>
<h1>pnminvert</h1>
Updated: 08 August 1989
<br>
<a href="#index">Table Of Contents</a>
<h2>NAME</h2>
pnminvert - invert a PNM image
<h2 id="synopsis">SYNOPSIS</h2>
<b>pnminvert</b>
[<i>pnmfile</i>]
<h2 id="description">DESCRIPTION</h2>
<p>This program is part of <a href="index.html">Netpbm</a>.
<p><b>pnminvert</b> reads a PNM image as input, inverts it black for
white, and produces a PNM image as output.
<p>If the image is grayscale, <b>pnminvert</b> replaces a pixel with
one of complementary brightness, i.e. if the original pixel has gamma-adjusted
gray value G, the output pixel has gray value maxval - G.
<p>If the image is color, <b>pnminvert</b> inverts each individual RGB
component the same as for a grayscale image.
<h2 id="options">OPTIONS</h2>
<p>There are no command line options defined specifically
for <b>pnminvert</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="pnm.html">pnm</a>
<h2 id="author">AUTHOR</h2>
Copyright (C) 1989 by Jef Poskanzer.
<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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