alpha channel
التعريفات والمعاني
== 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
α
A
+
(
1
−
α
)
B
{\displaystyle \alpha A+(1-\alpha )B}
that uses the Greek letter
α
{\displaystyle \alpha }
(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
{\displaystyle \alpha }
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 ====
=== References ===