Difference Key Node

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Difference Key Node.

This node produces a matte that isolates foreground content by comparing it with a reference background image.

Inputs

Image
Contains foreground content against the background that is to be removed.
Image
The reference background image.

Properties

Tolerance
Where pixels match the reference background to within the specified threshold, the matte is made transparent.
Falloff
Increase to make nearby pixels partially transparent producing a smoother blend along the edges.

Outputs

Image
Image with its alpha channel adjusted for the keyed selection.
Matte
A black and white alpha mask of the key.