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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2//EN">
<HTML><HEAD><TITLE>Ppmpat User Manual</TITLE></HEAD>
<BODY>
<H1>ppmpat</H1>
Updated: 24 November 2012
<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>-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>This program is mainly to demonstrate use of the ppmdraw routines,
a simple but powerful drawing library. See the ppmdraw.h include file
for more info on using these routines. Still, some of the patterns
can be rather pretty. If you have a color workstation, something like
<B>ppmpat -squig 300 300 | pnmquant 128</B>
should generate a nice background.
<p>Some of these 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>The options specify various pattern types:
<DL COMPACT>
<DT><B>-gingham2</B>
<DD>A gingham check pattern. Can be tiled.
<DT><B>-gingham3</B>
<DD>A slightly more complicated gingham. Can be tiled.
<DT><B>-madras</B>
<DD>A madras plaid. Can be tiled.
<DT><B>-tartan</B>
<DD>A tartan plaid. Can be tiled.
<DT><B>-poles</B>
<DD>Color gradients centered on randomly-placed poles.
<DT><B>-squig</B>
<DD>Squiggley tubular pattern. Can be tiled.
<DT><B>-camo</B>
<DD>Camouflage pattern.
<DT><B>-anticamo</B>
<DD>Anti-camouflage pattern - like -camo, but ultra-bright colors.
<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>
<A NAME="index"> </A>
<H2>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="#references">REFERENCES</A>
<LI><A HREF="#seealso">SEE ALSO</A>
<LI><A HREF="#author">AUTHOR</A>
</UL>
</BODY>
</HTML>
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