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Multimedia > Alpha Channel
The following information is about Alpha Channel.
Alpha Channel Defined
The alpha channel is used to specify an alpha value for each video sample. The alpha value is used to control the blending, on a sample-by-sample basis, of two images.
new pixel = (alpha)(sample A color) + (1 - alpha)(sample B color)
Alpha typically has a normalized value of 0 to 1. In a graphics environment, the alpha values can be stored in additional memory. When you hear about 32-bit frame buffers, what this really means is that there are 24 bits of color, 8 each for red, green, and blue, along with an 8-bit alpha channel. Also see alpha mix.
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Off-site Alpha Channel Links, User Submitted
The following links have been collected through user bookmark submission in the Alpha Channel category. Please note, because these resources are off-site we cannot guarantee the accuracy or quality of any information.
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- Backstage at Accenture: nice work of flash and chroma keying
Tue Oct 7
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Mon Sep 22
- Thomas Younsi: About straight and premultiplied channels
- Color Effects with Alpha Channel | 10Steps.SG - Photoshop and Flash tutorials
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Off-site Alpha Channel Research Links
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