After Effects Premultiplied Alpha . What is Premultiplied Alpha? A Primer for Artists. Limnu Premultiplied looks at what you're actually compositing in place of alpha 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.
Premultiplied vs Straight Alpha Apple Community from discussions.apple.com
Adobe Premiere Pro and After Effects recognize both straight and premultiplied channels, but only the first alpha channel they encounter in a file containing multiple alpha channels. 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.
Premultiplied vs Straight Alpha Apple Community This allows AE to interpret the Alpha correctly on any edges. Alpha channels can come pre-matted ("shaped") or as straight, with transparency anti-aliased only when composited After Effects Help explains Alpha channel interpretation: premultiplied or straight
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