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<h3 class="title"><a id="plug-in-semiflatten"></a>3.20. Semi-Flatten</h3>
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<p>
This filter is found in
<span class="guimenuitem">Image>Filters/Colors/<span class="accel">S</span>emi-Flatten</span>
It is available if your image holds an Alpha channel
(Image>Layers/Transparency/Add an alpha channel).
Otherwise, it is greyed out.
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<p>
The Semi-flatten filter helps those in need of a solution to anti-aliasing
indexed images with transparency. The GIF indexed format supports complete
transparency (0 or 255 alpha value), but not semi-transparency (1 - 254):
semi-transparent pixels will be transformed to no transparence
or complete transparence, ruining anti-aliasing you applied to the logo you
want to put onto your Web page.
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<p>
Before applying the filter, it's essential that you should know the background
color of your Web page. Use the color-picker to determine the exact color.
Click and drag this color from the Web
page to the Toolbox ForeGround color. Invert FG/BG colors so that BG color is
the same as Web background color.
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<p>
Semi-flatten process will combine FG color to layer (logo) color,
proportionally to corresponding alpha values, and will rebuild correct
anti-aliasing. Completely transparent pixels will not take the color. Very
transparent pixels will take a few color and weakly transparent
will take much color.
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This filter has no options.
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