User Manual

Inputs
The Difference Keyer node includes four inputs in the Node Editor.
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Background: The orange background input accepts a 2D image that contains just
the set without your subject.
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Foreground: The green foreground input accepts a 2D image that contains the shot
with your subject in the frame.
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Garbage Matte: The gray garbage matte input accepts a mask shape created by
polylines, basic primitive shapes, paint strokes, or bitmaps masks. Connecting a
mask to this input causes areas of the image that fall within the matte to be made
transparent.
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Solid Matte: The white solid matte input accepts a mask shape created by polylines,
basic primitive shapes, paint strokes, or bitmaps masks. Connecting a mask to this
input causes areas of the image that fall within the matte to be fully opaque.
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Effect Mask: The optional blue input expects a mask shape created by polylines,
basic primitive shapes, paint strokes, or bitmaps masks. Connecting a mask to this
input limits the pixels where the difference matte occurs. An effects mask is applied
to the tool after the tool is processed.
Basic Node Setup
When you do not have content shot on a blue or green screen, the Difference Keyer can be one
node in a chain of many used to extract an object from the background. The example below
has the MediaIn1 as the main subject and a clean background shot without the subject
(Background). A B-Spline is used to limit the area the Difference Keyer must deal with for
extraction. The result is a matte that can be used to help but not solve the key.
A Difference Keyer with two inputs: one of the subject on a
background and the other of just the background
Chapter – 98 Matte Nodes 2159