Hacker Newsnew | past | comments | ask | show | jobs | submitlogin

> Just browsing the source I see Porter Duff blend modes. Really, in 2025? Have fun dealing with alpha compositing issues on this one.

What should we be using in 2025? I thought pre-multiplied alpha is essentially what you go for if you want a chance of alpha compositing ending up correct, but my knowledge is probably outdated.



You absolutely want premult alpha when dealing with multiple transparent layers in graphics.


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.




Consider applying for YC's Winter 2027 batch! Applications are open till November 2.

Guidelines | FAQ | Lists | API | Security | Legal | Apply to YC | Contact

Search: