Using the Simple Choker

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Adobe After Effects 5 for Macintosh and Windows: Visual QuickPro Guide

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Table of Contents

Thank you.

Ch. 1. After Effects: The Big Picture

Ch. 2. Importing Footage into a Project

Ch. 3. Managing Footage

Ch. 4. Compositions

Ch. 5. Layer Basics

Ch. 6. Layer Editing

Ch. 7. Properties and Keyframes

Ch. 8. Playback, Previews, and RAM

Ch. 9. Mask Essentials

Ch. 10. Effects Fundamentals

Ch. 11. Standard Effects in Action

Ch. 12. More Layer Techniques

Ch. 13. Keyframe Interpolation

Ch. 14. 3D Layers

Ch. 15. Complex Projects

Ch. 16. Production Bundle Techniques

Keying Effects

Using a Garbage Matte

Using the Color Difference Key

Matte Tools

Using the Simple Choker

Production Bundle Audio Effects

Using Parametric EQ

Production Bundle Visual Effects

Using the Displacement Map Effect

Using the Glow Effect

Using Other Glow Settings

Using Vector Paint

Revealing a Layer with Vector Paint Strokes

Simulating Handwriting with Vector Paint

Using the Wiggler Plug-In Palette

Keyframe Assistants

Using Motion Math

Included Motion Math Scripts

Understanding the Motion Math Dialog Box

Running a Motion Math Script

Ch. 17. Output

Using the Simple Choker

A typical problem with mattes is that they can be a bit too large, revealing an unpleasant edge around the keyed subject. The solution is to choke the matte, which shrinks the matte slightly. You can use the Simple Choker effect to either choke or spread a matte to make a cleaner composite.

To use the Simple Choker:

1.	Select the layer containing the matte (Figure 16.29). Figure 16.29. Select the layer containing the matte.
2.	Choose Effect > Matte Tools > Simple Choker (Figure 16.30). Figure 16.30. Choose Effect > Matte Tools > Simple Choker. The Simple Choker effect appears selected in the Effect Controls window (Figure 16.31). Figure 16.31. The Simple Choker effect appears selected in the Effect Controls window.
3.	Choose an option from the View pull-down menu (Figure 16.32): Final Output lets you see the composited image in the Composition window. Matte lets you see the matte in the Composition window. Figure 16.32. Choose an option from the View pull-down menu.
4.	Set a value for Choke Matte to shrink or spread the matte (Figure 16.33). Figure 16.33. Negative values for Choke Matte shrink the matte, positive values spread it. Negative values spread the matte; positive values choke, or shrink, the matte.
5.	To see the final composited image in the Composition window, set the View option to Final Output.