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A comment on Faster, easier 2D vector rendering [video]. Parent comment

Re:Faster, easier 2D vector rendering [video] by kookamamie on Wednesday June 11, 2025 @08:12AM (#44246784)
You absolutely want premult alpha when dealing with multiple transparent layers in graphics.
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Re:Faster, easier 2D vector rendering [video] by bschwindHN on Wednesday June 11, 2025 @08:13AM (#44246797)
Right - maybe I'm mistaken but doesn't Porter-Duff compositing encompass premultiplied alpha?
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Re:Faster, easier 2D vector rendering [video] by kookamamie on Thursday June 12, 2025 @04:01AM (#44255162)
Yes, they introduced the concept in their paper. See this article for an in-depth guide to the topic: https://ciechanow.ski/alpha-compositing/
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Re:Faster, easier 2D vector rendering [video] by bschwindHN on Thursday June 12, 2025 @07:06AM (#44256231)
Great article! I'm going to have to take my time on that one.

But I guess I'm confused why @morio said "Just browsing the source I see Porter Duff blend modes. Really, in 2025?" because I'm not sure what they were expecting to be used in 2025.

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