Black, gray, and opacity

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i have thought logically, object @ 100% opacity filled 25% brightness gray (rgb 67/67/67) same 100% black (rgb 0/0/0) @ 75% opacity. on pure white background, using normal transfer mode, different.

 

can educate color dumbness , why photoshop cs6 displays these differently?

25% brightness gray in 8-bit per channel rgb (64, 64, 64), not (67, 67, 67).



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