alpha channel

短语

词形变化

alpha channels 复数 alpha channels

释义与例句

n.
  1. 1.

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

    计算机 工程 数学

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.

来源：wiktionary