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Chapter 3. Selections: The Key to Compositing > Compositing: Science and Nature

Compositing: Science and Nature

What exactly is happening in a simple A over B composite? You're just laying one image over another, right? Nothing to it—was obvious from the first time you used Photoshop, right?

For most people, the basic compositing operation is a completely intuitive process that is rarely questioned, but to deal with the crucial part of an A over B composite—the edge detail of layer A—it helps to know what is going on, not only in the world of software, but in the real world as well. The two worlds do not operate the same, but it is the job of the digital world to re-create, as faithfully as possible, what is happening in the natural world.


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