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Chapter 3. Selections: The Key to Compos... > Alpha Channels and Premultiplication

Alpha Channels and Premultiplication

Clearly, you don't need to be able to write out the compositing formula to composite, any more than you need to be able to design a car in order to drive one. After Effects helps you by shielding this formula and many other mathematical portions of the compositing operations from your view.

Zeno's Paradox goes something like this: Suppose I wish to cross the room. First, of course, I must cover half the distance. Then, I must cover half the remaining distance. Then, I must cover half the remaining distance. Then I must cover half the remaining distance, and so on forever. The consequence is that I can never get to the other side of the room.



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