How are we able to tell C = [0.75 0 0]^T with alpha_C = 0.75 is a premultiplied color?
kayvonf
@cat. Because 75% opaque red in non-premultiplied form would be C=[1.0, 0.0, 0.0] and alpha_C = .75. In non-premultiplied form, the color on the read is 75% opaque darker red.
farhanazam98
I am confused by this slide. Is the main idea that when compositing images, they must all be of the same form (either premultiplied or non-premultiplied)?
How are we able to tell C = [0.75 0 0]^T with alpha_C = 0.75 is a premultiplied color?
@cat. Because 75% opaque red in non-premultiplied form would be
C=[1.0, 0.0, 0.0]andalpha_C = .75. In non-premultiplied form, the color on the read is 75% opaque darker red.I am confused by this slide. Is the main idea that when compositing images, they must all be of the same form (either premultiplied or non-premultiplied)?