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<th colspan="3" align="center" id="chaptername">3.14. Color to Alpha</th>
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<h3 class="title"><a id="plug-in-colortoalpha"></a>3.14. Color to Alpha</h3>
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<p>
This filter is found in
<span class="guimenuitem">Image>Filters/Colors/Color
to <span class="accel">A</span>lpha</span>
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<p>
The Color to Alpha filter makes transparent all pixels with a
selected color. An Alpha channel is created. It will attempt to
preserve antialiasing information by using a partially
intelligent routine that replaces weak color information with
weak alpha information. In this way, areas that contain an
element of the selected color will maintain a blended appearence
with their surrounding pixels.
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<span class="term">Color</span>
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Clicking on the <span class="guilabel">From</span> color swatch
provides a color selection dialog where you can select a
color. If selection of a precise color is required, use
the Color Picker then drag and drop the selected color
from the color picker to the From color swatch. Right
clicking on the color will display a menu where you can
select Foreground or Background colors, White or Black.
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