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alpha channel

   Also found in: Wikipedia, Hutchinson 0.04 sec.

alpha channel

An 8-bit layer in a graphics file format that is used for expressing translucency (transparency). The extra eight bits per pixel serves as a mask and represents 256 levels of translucency. For example, TIFF and PNG are graphics formats that support the 8-bit alpha channel. The GIF89a format supports a 1-bit alpha channel that allows one color on the palette to be translucent.

Graphics formats that are native to their image editing application may support multiple alpha channels. For example, Photoshop's native PSD format can have a total of 24 channels, including color channels (RGB, CMYK, etc.) and alpha channels. When exported to another graphics format, the alpha channels are reduced to one or none depending on the format. See alpha blending.



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? Mentioned in ? References in periodicals archive
 
* A new subtitle workflow that converts EBU format subtitle files to a flat movie with alpha channel.
Avid Ships Latest Version of Avid Studio Toolkit; Enhanced solution ... by Business Wire
In addition, this version offers alpha channel support for blue-screen type special effects as well as embedded cue points and global metadata options.
Sorenson Media Delivers Sorenson Squeeze 4.3 Lineup Highlighting ... by Business Wire
--16-Bit SpectraMatte(TM) chroma keying - Real-time HD and SD chroma keying, enhanced with Avid's intuitive SpectraGraph(TM) UI and simultaneous alpha channel monitoring, gives professionals access to extremely responsive and high quality compositing tools.
Avid to Demonstrate Speed and HD Functionality of Symphony Nitris at ... by Business Wire
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