alpha channel

名词 n.
中文释义

英文释义

名词 n.
  1. A numerical value specifying a level of translucency to be applied to a colour.

词形变化

alpha channels plural

词源

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.
1 次浏览 数据来源: Wiktionary