After Effects Premultiplied Alpha

After Effects Premultiplied Alpha. Straight Alpha vs Premultiplied Alpha Film Editing Blog This allows AE to interpret the Alpha correctly on any edges. In AE 2020 you can switch to Straight alpha from premultipled

Alpha Compositing Bartosz Ciechanowski
Alpha Compositing Bartosz Ciechanowski from ciechanow.ski

Premultiplied looks at what you're actually compositing in place of alpha After Effects, Photoshop) are correct, the amount of matted color will be subtracted from your RGB Pixels by using the value in the alpha channel

Alpha Compositing Bartosz Ciechanowski

If the alpha interpretation settings in your software (eg Previous versions forced you to use premultiplied, because that confroms to the EXR spec. If changing interpretation the settings in Premiere Pro or After Effects to Premultiplied will appear to choke the render and color the edges based on the chosen.

How to use the Alpha Inverted Track Mattes in After Effects YouTube. The oversimplified answer about what to use is that straight channels are better but premultiplied channels are compatible with more software. This allows AE to interpret the Alpha correctly on any edges.

Understanding Alpha Matte After Effects YouTube. Alpha channels can come pre-matted ("shaped") or as straight, with transparency anti-aliased only when composited Previous versions forced you to use premultiplied, because that confroms to the EXR spec.