Conversation
Replying to
Two time Academy Scientific and Technical award winner Mr. Gritz on associated (premultiplied) and unassociated (straight / key / junk) alpha: groups.google.com/d/msg/osl-dev/
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Two time Academy Scientific and Technical award winner Jeremy Selan on associated (premultiplied) and unassociated (straight / key / junk) alpha: groups.google.com/forum/m/#!topi
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For posterity, the link to the original thread of the first quote is forums.adobe.com/thread/369637. Never let someone try to convince you that alpha should be unassociated / straight / key alpha.
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I was rereading the thread in the last link and thought I’d pull out a few extremely relevant and salient points brought up by Mr. Andersson. community.adobe.com/t5/photoshop/c and community.adobe.com/t5/photoshop/c Extremely valuable reads.
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Replying to @troy_s @aaronkennedy0 and 2 others
This is correct. Back when "that" discussion was happening I reached out to Alvy Ray himself, and yes, the original meaning of Alpha was the one true way, the "premultiplied way".
It's what naturally comes out of a renderer, when you shoot rays into a scene and filter to pixels
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