alpha channel en · NOUN
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 αA+(1-α)B that uses the Greek letter α (alpha) to control the amount of interpolation between, in this case, two images A and B". That is, when compositing image A atop image B, the value of α in the formula is A's alpha channel.
Meanings
- A numerical value specifying a level of translucency to be applied to a colour.
Forms
| Spelling | Features | Labels | Source |
|---|---|---|---|
| alpha channels | Number=Plur | lexicographic |
Translations (2)
pt canal alfa (numeric value) · fi alfakanava (numeric value)