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Alpha Channel

Audio/Video Glossary - Alpha ChannelThe Alpha channel is a separate channel of data, transmitted alongside the original color or video information - whether it is video or computer based. It is used to specify an Alpha value for each color pixel in order to control pixel based image blending and mixing. Values of the Alpha channel range between 0 and 1. (In SDI applications the Alpha channel uses 256 different levels from 0 to 1)