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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2//EN">
<HTML><HEAD><TITLE>Ppmwheel User Manual</TITLE></HEAD>
<BODY>
<H1>ppmwheel</H1>
Updated: 13 January 2019
<BR>
<A HREF="#index">Table Of Contents</A>
<H2>NAME</H2>
ppmwheel - make a PPM image of a color wheel
<H2 id="synopsis">SYNOPSIS</H2>
<B>ppmwheel</B>
<I>diameter</I>
<H2 id="description">DESCRIPTION</H2>
<p>This program is part of <a href="index.html">Netpbm</a>.
<p><b>ppmwheel</b> produces a PPM image of a color wheel of the
specified diameter inside a white square just large enough to hold it.
<p>The color wheel is based on the HSV color model. Hues are
distributed angularly around the circle and the values are distributed
radially and the saturation is 100% everywhere. The values are zero at
the center, increasing linearly to maximum at the edge. The maximum value
corresponds to the maxval of the PPM image.
<p>Hence, the image consists of all of the secondary colors based on the red,
green, and blue primary colors. A secondary color is one that is composed of
light of at most two of the three primary colors.
<H2 id="options">OPTIONS</H2>
<P>None.
<H2 id="seealso">SEE ALSO</H2>
<B><A HREF="ppmcie.html">ppmcie</A></B>,
<B><A HREF="ppmrainbow.html">ppmrainbow</A></B>,
<B><A HREF="ppm.html">ppm</A></B>
<H2 id="history">HISTORY</H2>
<P><b>ppmwheel</b> was added to Netpbm in Release 10.14 (March 2003).
<H2 id="author">AUTHOR</H2>
Copyright (C) 1995 by Peter Kirchgessner
<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="#history">HISTORY</A>
<LI><A HREF="#author">AUTHOR</A>
</UL>
</BODY>
</HTML>
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