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Comment by bschwindHN

6 days ago

Right - maybe I'm mistaken but doesn't Porter-Duff compositing encompass premultiplied alpha?

Yes, they introduced the concept in their paper. See this article for an in-depth guide to the topic: https://ciechanow.ski/alpha-compositing/

  • 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.