After Effects Premultiplied Alpha

After Effects Premultiplied Alpha. What Is Premultiplication? Tutorial YouTube The gist of the difference is this: Premultiplied color channels include some amount of the background (matte) color in areas of partial transparency Straight alpha channels, which are optimal, are purely defined by a level of transparency, without "premultiplying" it to any specific color.

Straight vs Premultiplied Understanding Alpha Channels YouTube
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Previous versions forced you to use premultiplied, because that confroms to the EXR spec. This allows AE to interpret the Alpha correctly on any edges.

Straight vs Premultiplied Understanding Alpha Channels YouTube

After Effects Help explains Alpha channel interpretation: premultiplied or straight In AE 2020 you can switch to Straight alpha from premultipled Previous versions forced you to use premultiplied, because that confroms to the EXR spec.

Alpha blending using premultiplied alpha Snorri Sturluson Veteran game developer (Arctic. Alpha channels can come pre-matted ("shaped") or as straight, with transparency anti-aliased only when composited Straight alpha assumes the transparent area is completely lacking in any rgb values, so transparent falloff is a straight fade to nothing

Solved Same animation file w premultiplied alpha renders Adobe Support Community 11143764. This allows AE to interpret the Alpha correctly on any edges. In After Effects, for example, you might have your background set to blue, despite it being transparent.