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Keying Effects

In order to combine a moving element with a different background, you usually must rely on a technique known as keying.

The term key actually refers to its counterpart, the keyhole. Keying cuts a hole in the image, making it transparent. The hole is then filled with another image. If the concept sounds similar to mattes and fills, or even masks and alpha channels, it is. In the end, all of these methods modify the alpha channel to make certain areas of the image transparent.


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