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<h3 class="title"><a id="plug-in-despeckle"></a>6.3. Despeckle</h3>
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<a id="id3362494" class="indexterm"></a>
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<h4 class="title"><a id="id3360874"></a>Overview</h4>
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<p>
This filter is found in
<span class="guimenuitem">Image>Filters/Enhance/Des<span class="accel">p</span>eckle</span>
</p>
<p>
It is used to remove small defects due to dust, or scratches, on a scanned image,
and also moiré effect on image scanned from a magazine. You ought to select isolated
defects before applying filter.
</p>
<div class="variablelist">
<p class="title">
<b>Options</b>
</p>
<dl>
<dt>
<span class="term">Preview</span>
</dt>
<dd>
<p>
Parameter setting results are interactively displayed in preview.
</p>
</dd>
<dt>
<span class="term">Type</span>
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<p>
</p>
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<li>
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<span class="guilabel">Adaptive</span>: Adapts radius to image or selection content
(using Histogram). If this option is checked, radius slider is not efficient.
It renders a result smoother than with radius alone.
</p>
</li>
<li>
<p>
<span class="guilabel">Recursive</span>: Repeats filter action which gets stronger.
</p>
</li>
</ul>
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</dd>
<dt>
<span class="term">Parameters settings</span>
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<p>
</p>
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<li>
<p>
<span class="guilabel">Radius</span>: Sets size of action window from 1 (3x3 pixels)
to 20 (41x41). This window moves over image, and the color in it is smoothed,
so imperfections are removed.
</p>
</li>
<li>
<p>
<span class="guilabel">Black level</span>: Removes pixels darker than set value (0-255).
</p>
</li>
<li>
<p>
<span class="guilabel">White level</span>: Removes pixels whiter than set value (0-255).
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