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Creating Motion Graphics with After Effects, 5th Edition by Trish Meyer, Chris Meyer

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24 Compound Effects

Compound effects may seem nonintuitive at first, but they require learning only a few simple rules

A compound effect is one that looks at a second layer to decide exactly how to treat the layer it is applied to. Examples of these vary from Compound Blur – which can selectively blur one layer based on the varying luminance values of another – to Texturize, which is great for simulating those embossed station identity bugs most networks use these days, among other things.

The “modifying” layer that a compound effect points to can range from a simple gradient to a second movie or composition. In most cases, the information being passed is the brightness values of each pixel of a grayscale image, or the luminance values in a color ...

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