When antialiasing, I think you do want to model light: a fully black object occluding 40% of a pixel should cause it to emit 40% less light. Linear intensity representations of colour should therefore be used.
When doing a smooth fade-to-black in video, you may want to gradually decrease the amount of emitted light from the whole frame in a way that is smooth to a human. Here I think you should consider how a perceptual space can help.
When doing a smooth fade-to-black in video, you may want to gradually decrease the amount of emitted light from the whole frame in a way that is smooth to a human. Here I think you should consider how a perceptual space can help.