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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.3//EN">
<html><head><title>Ppmdist User Manual</title></head>
<body>
<h1>ppmdist</h1>
Updated: 22 July 1992
<br>
<a href="#index">Table Of Contents</a>
<h2>NAME</h2>
ppmdist - simplistic grayscale assignment for machine generated, color images
<h2 id="synopsis">SYNOPSIS</h2>
<b>ppmdist</b>
[<b>-intensity</b>|<b>-frequency</b>]
[<i>ppmfile</i>]
<h2 id="description">DESCRIPTION</h2>
<p>This program is part of <a href="index.html">Netpbm</a>.
<p><b>ppmdist</b> reads a PPM image as input and performs a simplistic
grayscale assignment intended for use with grayscale or bitmap
printers.
<p>Often conversion from ppm to pgm will yield an image with contrast
too low for good printer output. The program maximizes contrast
between the gray levels output.
<p>A ppm input of n colors is read, and a pgm of n gray levels is
written. The gray levels take on the values 0..n-1, while maxval
takes on n-1.
<p>The mapping from color to stepped grayscale can be performed in
order of input pixel intensity, or input pixel frequency (number of
repetitions).
<p>This program is helpful only for images with a very small number of
colors.
<h2 id="options">OPTIONS</h2>
<p>In addition to the options common to all programs based on libnetpbm
(most notably <b>-quiet</b>, see <a href="index.html#commonoptions">
Common Options</a>), <b>ppmdist</b> recognizes the following
command line options:
<dl compact>
<dt><b>-frequency</b>
<dd>Sort input colors by the number of times a color appears in the
input, before mapping to evenly distributed graylevels of output.
<dt><b>-intensity</b>
<dd>Sort input colors by their grayscale intensity, before mapping to
evenly distributed graylevels of output. This is the default.
</dl>
<h2 id="seealso">SEE ALSO</h2>
<a href="ppmtopgm.html">ppmtopgm</a>,
<a href="ppmhist.html">ppmhist</a>,
<a href="ppm.html">ppm</a>
<h2 id="author">AUTHOR</h2>
Copyright (C) 1993 by Dan Stromberg.
<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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