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Alpha channels: premultiplied vs straight

June 20, 2014, 07:06 AM

http://provideocoalition.com/ryoung/story/alpha-ch...

Alpha channels are grayscale channels in addition to the color channels of a file. They define transparency and often delineate objects or selections as a matte or stencil. Alpha channels can come pre-matted ("shaped") or as straight, that is, anti-aliased when composited.

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