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Flash + After Effects, 2nd Edition by Chris Jackson

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CHAPTER 5 Alpha Channels

Importing video into Flash is nothing new. Flash also supports an 8-bit alpha channel opening up more creative possibilities for Flash designers. Alpha channels can enhance the user experience in your video-based Flash applications.

What Are Alpha Channels?

An RGB image contains three color channels—red, green, and blue. When combined, these channels produce the full color image. The alpha channel is a fourth channel that contains an 8-bit grayscale image. This image determines the transparency of each pixel. Black pixels become transparent, and white pixels are opaque. Any value in-between black and white has a certain degree of transparency. A 32-bit color image contains 24-bit color information with an 8-bit alpha ...

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