alpha channel
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English
Etymology
Coined by Alvy Ray Smith and Ed Catmull in the 1970s. Smith writes: "We called it that because of the classic linear interpolation formula that uses the Greek letter (alpha) to control the amount of interpolation between, in this case, two images A and B".[1] That is, when compositing image A atop image B, the value of in the formula is A's alpha channel.
Noun
alpha channel (plural alpha channels)
- (computer graphics) A numerical value specifying a level of translucency to be applied to a colour.
Translations
numeric value
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References
- ^ Alvy Ray Smith (1995 August 15) “Alpha and the History of Digital Compositing”, in alvyray.com, archived from the original on 25 October 2021, page 6