Use Pixel Spread to create a stretching effect from the image edges delimited by a matte. This can be useful to solve keying problems resulting from dark edges around the area to be keyed, for example.
To access the Pixel Spread menu, use:
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Batch, then select a node from the Node bin.
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Timeline, then use Batch FX (see Creating Batch 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, back and matte clip, as well as a vector map clip, and outputs a result and an outmatte.