Adobe® After Effects® 7.0 Classroom in a Book®

Chapter 7. Keying

The word keying might conjure up images of a weather person on the evening news, or a shooting technique used in major motion pictures, but with After Effects, even the simplest, least-expensive project can take advantage of this technique.

Lesson overview

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In this lesson, you’ll learn how to do the following:

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Create a garbage mask.

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Use the Color Difference Key effect to key an image.

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Check an image’s alpha channel for errors in a key.

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Use the Spill Suppressor effect to remove unwanted light spill.

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Pull a ...