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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.3//EN">
<html><head><title>Ppmpat User Manual</title></head>
<body>
<h1>ppmpat</h1>
Updated: 12 November 2023
<br>
<a href="#index">Table Of Contents</a>
<h2>NAME</h2>
ppmpat - make a pretty PPM image
<h2 id="synopsis">SYNOPSIS</h2>
<b>ppmpat</b>
[{<b>-gingham2</b>|<b>-g2</b>} |
{<b>-gingham3</b>|<b>-g3</b>} |
<b>-madras</b> |
<b>-tartan</b> |
<b>-poles</b> |
<b>-squig</b> |
<b>-camo</b> |
<b>-anticamo</b> |
<b>-argyle1</b> |
<b>-argyle2</b>]
[<b>-color</b> <i>colorlist</i>]
[<b>-mesh</b>]
[<b>-randomseed</b> <i>integer</i>]
<i>width</i> <i>height</i>
<p>You can abbreviate any option to its shortest unique prefix.
<h2 id="description">DESCRIPTION</h2>
<p>This program is part of <a href="index.html">Netpbm</a>.
<p><b>ppmpat</b> produces a PPM of the specified width and height,
with a pattern in it.
<p>You could, for example, use it to create wallpaper for a computer screen.
<p>One use of this program is as an example of the Netpbm library
<a href="libnetpbm_draw.html">drawing</a> functions, which it uses.
<p>Some of the patterns have large numbers of colors, so if you want
a simpler pattern, use <b>pnmquant</b> on the output.
<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>ppmpat</b> recognizes the following
command line options:
<h3 id="patspec">Pattern Specification</h3>
<p>Specify the pattern type with these options. One pattern type must
be specified.
<dl compact>
<dt><b>-gingham2</b> <b>-g2</b>
<dd>A gingham check pattern. Can be tiled.
<p>If you specify -color, give two colors: background and foreground, in that
order.
<dt><b>-gingham3</b> <b>-g3</b>
<dd>A slightly more complicated gingham. Can be tiled.
<p>If you specify -color, give three colors: background and two foregrounds,
in that order.
<dt><b>-madras</b>
<dd>A madras plaid. Can be tiled.
<p>If you specify -color, give three colors: background and two foregrounds,
in that order.
<dt><b>-tartan</b>
<dd>A tartan plaid. Can be tiled.
<p>If you specify -color, give three colors: background and two foregrounds,
in that order.
<dt><b>-poles</b>
<dd>Color gradients centered on randomly-placed poles: a Voronoi diagram.
<p>(There are many examples of this pattern in nature. One is the hide of a
giraffe).
<p>If you specify -color, give two or more colors.
<dt><b>-squig</b>
<dd>Squiggley tubular pattern. Can be tiled.
<p>If you specify -color, give three or more colors. The first is the
background color.
<dt><b>-camo</b>
<dd>Camouflage pattern.
<p>If you specify <b>-color</b>, give three or more colors. The first is the
background color; the others are colors for the leafy foreground shapes.
The foreground shapes will probably occupy nearly the entire image, so that the
background color is barely visible.
<dt><b>-anticamo</b>
<dd>Anti-camouflage pattern - like -camo, but ultra-bright colors.
<p>If you specify <b>-color</b>, this is the same as <b>-camo</b>.
<dt><b>-argyle1</b>
<dd>A diamond argyle pattern, without a cross through the diamond, with one
diamond. Can be tiled.
<p>If you specify -color, give two colors: background and foreground, in that
order.
<p>This option was new in Netpbm 10.78 (March 2017).
<dt><b>-argyle2</b>
<dd>A diamond argyle pattern, with a cross through the diamond, with one
diamond. Can be tiled.
<p>If you specify -color, give three colors: background, foreground, and
stripe, in that order.
<p>This option was new in Netpbm 10.78 (March 2017).
</dl>
<h3 id="otheropts">Other Options</h3>
<dl compact>
<dt><b>-color</b> <i>colorlist</i>
<dd>This specifies the colors to appear in the pattern.
<p>If you do not specify this option, <b>ppmpat</b> chooses colors at random.
<p>Different patterns take different numbers of colors. Some can involve
variable numbers of colors. If you specify a number of colors incompatible
with the pattern you specify, <b>ppmpat</b> fails, telling you how many colors
to specify.
<p><i>colorlist</i> is a comma-separated list of colors.
<p>Specify each color as described for the <a
href="libnetpbm_image.html#colorname">argument of the <b>pnm_parsecolor()</b>
library routine</a>.
<p>Example: <b>-color red, green, rgbi:1.0/0.5/.25</b> .
<p>This option was new in Netpbm 10.78 (March 2017).
<dt><b>-mesh</b>
<dd>This option affects the patterns generated by the
<b>-gingham2</b>, <b>-gingham3</b>, <b>-madras</b>, and <b>-tartan</b>. When
this option is <em>not</em> specified, when two colors intersect, the program
mixes them and puts the average in the rectangular intersection region.
with <b>-mesh</b>, the program fills that region with a checkerboard pattern
consisting of the two colors. The resulting image looks like a true woven
fabric, with separate threads for the separate colors.
<p>This option was new in Netpbm 10.97 (December 2021).
<dt><b>-randomseed</b> <i>integer</i>
<dd>This is the seed for the random number generator that generates the
pixels.
<p>Use this to ensure you get the same image on separate invocations.
<p>By default, <b>ppmpat</b> uses a seed derived from the time of day
and process ID, which gives you fairly uncorrelated results in multiple
invocations.
<p>This option was new in Netpbm 10.61 (December 2012).
</dl>
<h2 id="references">REFERENCES</h2>
Some of the patterns are from "Designer's Guide to Color 3"
by Jeanne Allen.
<h2 id="seealso">SEE ALSO</h2>
<a href="pnmtile.html">pnmtile</a>,
<a href="pnmquant.html">pnmquant</a>,
<a href="ppmmake.html">ppmmake</a>,
<a href="ppmrainbow.html">ppmrainbow</a>,
<a href="pamgradient.html">pamgradient</a>,
<a href="ppm.html">ppm</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>
<ul>
<li><a href="#patspec">Pattern Specification</a>
<li><a href="#otheropts">Other Options</a>
</ul>
<li><a href="#references">REFERENCES</a>
<li><a href="#seealso">SEE ALSO</a>
<li><a href="#author">AUTHOR</a>
</ul>
</body>
</html>
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