Alpha blending: Difference between revisions

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Revision as of 15:54, 9 November 2005

Alpha blending is a convex combination of two colors allowing for transparency effects in computer graphics. The value of alpha in the color code ranges from 0.0 to 1.0, where 0.0 represents a fully transparent color, and 1.0 represents a fully opaque color.

The value of the resulting color when color Value1 is drawn over a background of color Value0 is given by:

Value = Value0(1.0 − alpha) + Value1(alpha)

The alpha component is used to blend to red, green and blue components equally, as in 32-bit RGBA, or, alternatively, there are three alpha values specified corresponding to each of the primary colors for spectral color filtering.

Alpha blending is natively supported by these operating systems/GUIs:

Mac OS X
Windows Me, 2000, XP
most Linux graphical user interfaces (GUIs)

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-'''Alpha blending''' is a [[convex combination]] of two [[colour]]s allowing for [[transparency]] effects in [[computer graphic]]s. The value of <code>[[alpha]]</code> in the colour code ranges from 0.0 to 1.0, where 0.0 represents a fully transparent colour, and 1.0 represents a fully opaque colour.
+'''Alpha blending''' is a [[convex combination]] of two [[color]]s allowing for [[transparency]] effects in [[computer graphic]]s. The value of <code>[[alpha]]</code> in the color code ranges from 0.0 to 1.0, where 0.0 represents a fully transparent color, and 1.0 represents a fully opaque color.
-The value of the resulting colour when colour <code>Value1</code> is drawn over a background of colour <code>Value0</code> is given by:
+The value of the resulting color when color <code>Value1</code> is drawn over a background of color <code>Value0</code> is given by:
 :<code>''Value''&nbsp;=&nbsp;''Value0''(1.0&nbsp;&minus;&nbsp;''alpha'')&nbsp;+&nbsp;''Value1''(''alpha'')</code>
-The alpha component is used to blend to [[red]], [[green]] and [[blue]] components equally, as in [[32-bit]] [[RGBA]], or, alternatively, there are three alpha values specified corresponding to each of the [[primary colour]]s for [[spectral colour]] [[filter (optics)|filter]]ing.
+The alpha component is used to blend to [[red]], [[green]] and [[blue]] components equally, as in [[32-bit]] [[RGBA]], or, alternatively, there are three alpha values specified corresponding to each of the [[primary color]]s for [[spectral color]] [[filter (optics)|filter]]ing.
 Alpha blending is natively supported by these operating systems/GUIs:
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 [[Category:Computer graphics]]
-[[Category:Colour]] [[Category:Color]]
+[[Category:Color]]
 [[he:&#1506;&#1512;&#1489;&#1493;&#1500; &#1488;&#1500;&#1508;&#1488;]]

Revision as of 15:54, 9 November 2005

See also