alpha blending


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alpha blending

In computer graphics, the combining of the alpha channel with other layers in an image in order to show translucency. The alpha channel is an additional eight bits used with each pixel in a 32-bit graphics system that can represent 256 levels of translucency. Black and white represent opaque and fully transparent, while various gray levels represent levels of translucency.

More than one layer in a multilayered image may contain a translucent component, thus multiple levels of blending may be required. If the graphics accelerator performs the blending in its own hardware, the results are displayed considerably faster. See alpha channel and translucency.


Using the Alpha Channel
The image on the right shows how translucency can be applied to an object using the alpha channel. (Image courtesy of Intergraph Computer Systems.)
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In addition it includes alpha blending and masking, cropping and scaling capabilities, brightness, contrast and saturation control and picture-in-picture for implementing video telephony and channel preview for mobile TV.
It also provides 2D drawing primitives (lines, rectangles, and polygons), text primitives (fonts, with support for internationalization), overlay primitives (video overlays), alpha blending and basic windowing.
Other key features include support for double-buffered overlays, window IDs, texture mapping, stencils, alpha blending, per-pixel depth cueing, and fog.