Use the Garbage Mask to isolate particular areas of an image to include with, or exclude from, the opaque area of the matte.
To access the Garbage Mask menu, use:
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Timeline, then use ConnectFX (see Creating ConnectFX).
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Timeline, then add Timeline FX from the Effects ribbon (see Adding Timeline FX).
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Tools, then select from the menu (See Accessing Tools).
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The Modular Keyer, then select a node from the Node bin.
This node accepts a front and a matte clip as input, and outputs a result.
The Garbage Mask menu includes the Tracer and the region of Interest (ROI) functions, which can also be found in the Modular Keyer. The node processes gaps in clips set to No Media as black frames. An unconnected front clip will return an error, while and unconnected back clip will process black frames. You can save and load GMask setups directly in ConnectFX.