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<title>10.13. Value Propagate</title>
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<th colspan="3" align="center" id="chaptername">10.13. Value Propagate</th>
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<div class="sect2" lang="en" xml:lang="en">
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<div>
<h3 class="title"><a id="plug-in-vpropagate"></a>10.13. Value Propagate</h3>
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<a id="id3368861" class="indexterm"></a>
<div class="mediaobject">
<img src="../images/filters/filters-distort-vpropagate.png" />
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<h4 class="title"><a id="id3368858"></a>Overview</h4>
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<p>
This filter is found in
<span class="guimenuitem">Image>Filters/Distorts/<span class="accel">V</span>alue Propagate</span>
</p>
<p>
It works on color borders. It spreads pixels that have a Value
between selected thresholds, in selected directions.
</p>
</div>
<div class="simplesect" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h4 class="title"><a id="id3368943"></a>Options</h4>
</div>
</div>
</div>
<div class="variablelist">
<dl>
<dt>
<span class="term">Propagate Mode</span>
</dt>
<dd>
<p>
The examples will be about the following image (zomm x8):
</p>
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<img src="../images/filters/examples/vpropag0-en.png" />
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<p>
</p>
<div class="itemizedlist">
<ul type="disc">
<li>
<p>
<span class="guilabel">More White</span>: Pixels will be propagated
from upper Value pixels towards lower Value pixels. So bright
areas will enlarge.
</p>
<div class="mediaobject">
<img src="../images/filters/examples/vpropag1.png" />
</div>
<p>
</p>
</li>
<li>
<p>
<span class="guilabel">More Black</span>: Pixels will be propagated
from lower Value pixels towards upper Value pixels. So dark
areas will enlarge.
</p>
<div class="mediaobject">
<img src="../images/filters/examples/vpropag2.png" />
</div>
<p>
</p>
</li>
<li>
<p>
<span class="guilabel">Middle Value to Peaks</span>: On a border between
the selected thresholds, it blends the two colors.
</p>
<div class="mediaobject">
<img src="../images/filters/examples/vpropag3.png" />
</div>
<p>
</p>
</li>
<li>
<p>
<span class="guilabel">Foregound to Peaks</span>: The propagated areas
will be filled with the foreground color of the toolbox.
</p>
<div class="mediaobject">
<img src="../images/filters/examples/vpropag4.png" />
</div>
<p>
</p>
</li>
<li>
<p>
<span class="guilabel">Only Foreground</span>: Only areas with the
Foreground color will propagate.
</p>
<div class="mediaobject">
<img src="../images/filters/examples/vpropag5.png" />
</div>
<p>
</p>
</li>
<li>
<p>
<span class="guilabel">Only Background</span>: Only areas with the
Background color will propagate.
</p>
</li>
<li>
<p>
<span class="guilabel">More Opaque</span> and <span class="guilabel">More Tranparent</span>:
These commands work like More White and More Black. Propagated
areas will be more opaque or more transparent. These commands
need an image with an Alpha channel.
</p>
</li>
</ul>
</div>
</dd>
<dt>
<span class="term">Parameters Settings</span>
</dt>
<dd>
<div class="itemizedlist">
<ul type="disc">
<li>
<p>
<span class="guilabel">Lower Threshold</span> and <span class="guilabel">Upper Threshold</span>:
These commands allow you to set the Value range that will
be concerned by Propagate.
</p>
</li>
<li>
<p>
<span class="guilabel">Propagating Rate</span>: That's the
propagating amount. The higher it will be the more
colored the propagation will be.
</p>
</li>
<li>
<p>
<span class="guilabel">Propagating Direction</span>: You can select
one or more directions.
</p>
</li>
</ul>
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</dd>
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