Using a garbage matte

A garbage matte is merely a portion of a bluescreen scene that contains only the subject that you need. The remainder of the scene, which may contain undesired objects, is not important and is masked out. The keyed subject can be placed in another scene for still sequences or simple effects.

To create a garbage matte:

1. Use the Mask Tool to roughly outline a subject in bluescreen footage.
2. Apply one or more keys to mask out the remainder of the bluescreen scene.
3. Apply matte tools as necessary to fine-tune the matte.