User Guide

20
An Overview of Adobe After Effects
Keying effects
The Production Bundle of After Effects delivers sophisticated keying controls for producing
precise composites. The Linear Color Key uses the RGB, hue, or chroma information you
specify to create transparency from a key color. With the Color Difference key, you can
produce combination mattes to control hard-to-key images such as smoke, shadows, or
glass. The Spill Suppressor makes it easy to remove key-color traces from light reflecting off
a screen and onto your subject. Create clean mattes with the Simple Choker, or choke and
spread the matte to create clean edges with the Matte Choker. The Inner/Outer Key effect
makes it easy to extract an object from its background. And you can perform other special-
ized keying tasks with the Extract, Difference Matte, Color Range, and Alpha Levels keys.
After Effects color keying lets you isolate objects from a colored
background for compositing with different layers.
Motion tools
From reducing unwanted motion to creating natural-looking zoom effects, After
Effects delivers the tools you need to produce the highest-quality animations. Use the
Motion Tracker to isolate a moving element on one layer and precisely track it to a moving
element on another layer. The Motion Stabilizer tracks a single element on a layer to
stabilize unwanted motion. With the Wiggler, you can simulate more realistic motion by
adding random changes to any property over time.
UG.book Page 20 Wednesday, February 21, 2001 12:05 PM