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What is Alpha Blending?
Each pixel has three channels of colour information: Red, Green, and Blue and sometimes a fourth called the "Alpha" channel. This channel controls the way in which other graphics information is displayed, such as levels of transparency or opacity. Alpha blending is the name for this type of control, and it's used to simulate effects such as placing a piece of glass in front of an object so that the object is completely visible behind the glass, unviewable, or something in between.

This effect can be clearly seen in this screenshot, which shows Lockit using its Alpha Blending function which enables you to see the window behind it and Lockit at the same time.

Please note: The Alpha Blending function is only available when using Microsoft Windows® 2000/XP.  
Alpha blending can also be used for drop shadows, these are usually seen on menus and cursors which can be seen in the screen shot on the left.
Article ID: QPNISN
Keywords: Alpha Blending, Alpha, Translucent, Translucence
Date: 11/09/2004
Time: 15:06:37
Article ID:
 
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