Adobe 12040118 - After Effects Standard, Tutorial

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2. Apply one or more keying effects to mask out the remainder of the background.
3. Apply Matte effects as necessary to fine-tune the matte.
Aharon Rabinowitz provides a video tutorial on the Creative COW website that shows how to create a super-tight garbage matte using Auto-trace.
Use a hold-out matte
Use a hold-out matte (also known as a hold-back matte) to patch a scene to which a keying effect has been applied.
A hold-out matte is a masked-out portion of a duplicate of a layer that you have keyed. The duplicate is masked to include only the area of the
image that contains the key color that you want to preserve as opaque. The hold-out matte is then placed directly on top of the keyed layer.
Example of using a hold-out matte
A. Original bluescreen image. The background for the number is also blue. B. After keying, the background for the number is also
transparent. C. Hold-out matte containing the part of the image you want to remain opaque D. When the hold-out matte is placed on top of the
keyed image, the background for the number is now opaque.
1. Duplicate the layer containing the color screen.
2. Apply keying effects and Matte effects to the original layer to create transparency.
3. On the duplicate layer, create masks to mask out everything in the image except the area that you want to preserve.
4. Make sure that the copy (the hold-out matte) is positioned directly on top of the keyed layer.
Note: Don’t change Transform properties of only one of the layers after making the duplicate; keep the layers moving together. Consider
parenting one to the other. (See Parent and child layers.)
More Help topics
Maintaining consistent color for background keying
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