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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2//EN">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Pampaintspill User Manual</title>
<meta http-equiv="content-type" content="text/html; charset=us-ascii" />
</head>
<body>
<h1>pampaintspill</h1>
<p><a href="#index">Table Of Contents</a></p>
<p>pampaintspill - smoothly spill colors into the background</p>
<h2><a name="synopsis">SYNOPSIS</a></h2>
<p>
<b>pampaintspill</b>
[<b>--bgcolor</b>=<i>color</i>]
[<b>--wrap</b>] [<b>--all</b>]
[<b>--downsample</b>=<i>number</i>]
[<b>--power</b>=<i>number</i>] [<i>filename</i>]</p>
<P>Minimum unique abbreviations of option are acceptable. You may use
double hyphens instead of single hyphen to denote options. You may use
white space in place of the equals sign to separate an option name
from its value.
<h2 id="description">DESCRIPTION</h2>
<p>This program is part of <a href="index.html">Netpbm</a>.</p>
<p><b>pampaintspill</b> produces a smooth color gradient from all of the
non-background-colored pixels in an input image, effectively "spilling
paint" onto the background. <b>pampaintspill</b> is similar to
<b>pamgradient</b> but differs in the following characteristics:</p>
<ul>
<li><b>pampaintspill</b> accepts any number of paint
sources (non-background-colored pixels), which can lie anywhere
on the canvas. <b>pamgradient</b> accepts exactly
four paint sources, one in each corner of the image.</li>
<li><b>pampaintspill</b> requires an input image while
<b>pamgradient</b> generates a new image from
scratch.</li>
<li><b>pampaintspill</b> can produce tileable output and
can control how tightly the gradient colors bind to their source
pixels.
</ul>
<p>Results are generally best when the input image contains just a few, crisp
spots of color. Use your drawing program's pencil tool — as opposed to a
paintbrush or airbrush tool — with a small nib.</p>
<h2 id="options">OPTIONS</h2>
<dl>
<dt><b>--bgcolor</b>=<i>color</i></dt>
<dd>Explicitly specify the background color. <i>color</i> can be
specified using any of the formats accepted by the <a
href="libppm.html#colorname"><code>ppm_parsecolor()</code> library
routine</a> such as <code>red</code> or <code>#ff0000</code>. If
<b>--bgcolor</b> is not specified, <b>pampaintspill</b> makes an
educated guess about the background color based on the colors in the
image's corners.</dd>
<dt><b>--wrap</b></dt>
<dd>Allow gradients to wrap around image borders. That is, colors
that spill off the right side of the image reappear on the left side of
the image and likewise for left/right, top/bottom, and
bottom/top. <b>--wrap</b> makes images tileable, which is nice for
producing desktop backgrounds.</dd>
<dt><b>--all</b></dt>
<dd>Recolor all pixels, not just background pixels. Normally,
non-background-colored pixels in the input image appear unmodified in
the output image. With <b>--all</b>, <em>all</em> pixels are colored
based on their distance from all of the (other) non-background-colored
pixels.</dd>
<dt><b>--downsample</b>=<i>number</i></dt>
<dd>Ignore all but <i>number</i> non-background-colored pixels.
When a large number of pixels in the input image differ in color from
the background, <b>pampaintspill</b> runs very slowly. The
<b>--downsample</b> option randomly selects a given number of colored
pixels to use as paint sources for the gradients and ignores the rest,
thereby trading off image quality for speed of execution.</dd>
<dt><b>--power</b>=<i>number</i></dt>
<dd>Control how color intensity changes as a function of the
distance from a paint source. The default value for <i>number</i> is
-2.0, which means that intensity drops (because of the minus sign) with
the square (because of the 2.0) of the distance from each paint
source. -2.0 generally works well in practice, but other values can be
specified for various special effects. With very small numbers of paint
sources, -1.0 may produce subtler gradients, but these get muddier as
the number of paint sources increases. Positive numbers (e.g., 1.0 and
2.0) make the paint sources stand out in the output image by pushing the
gradients away from them.</dd>
</dl>
<h2 id="see_also">SEE ALSO</h2>
<ul>
<li><a href="pamgradient.html">pamgradient</a>
<li><A href="ppmmake.html"><b>ppmmake</b></A>,
<li><A href="ppmrainbow.html"><b>ppmrainbow</b></A>,
<li><A href="pgmramp.html"><b>pgmramp</b></A>,
<li><A href="ppmpat.html"><b>ppmpat</b></A>,
<li><a href="pam.html">pam</a>
</ul>
<h2 id="history">HISTORY</h2>
<p><b>pampaintspill</b> was new in Netpbm 10.50 (March 2010).
<h2 id="copyright">COPYRIGHT</h2>
<p>Copyright © 2010 Scott Pakin,
<a href="mailto:scott+pbm@pakin.org"><i>scott+pbm@pakin.org</i></a>.
<h2 id="index">Table Of Contents</h2>
<ul>
<li><a href="#name">NAME</a></li>
<li><a href="#synopsis">SYNOPSIS</a></li>
<li><a href="#description">DESCRIPTION</a></li>
<li><a href="#options">OPTIONS</a></li>
<li><a href="#see_also">SEE ALSO</a></li>
<li><a href="#history">HISTORY</a></li>
<li><a href="#copyright">COPYRIGHT</a></li>
</ul>
</body>
</html>
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