Creating garbage mattesSometimes the subject of a scene is properly keyed except for undesired objects. Use a garbage matte to mask out those objects. You can then place the keyed subject in another scene for simple effects. ![]() The microphone (left) is masked out by repositioning image handles in the Transparency dialog box (center), creating a garbage matte that is then keyed and superimposed over a background (right). To create a garbage matte:
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