User Manual

Solid Matte
Solid mattes are mask nodes or images connected to the solid matte input on the node.
The solid matte is applied directly to the Alpha channel of the image. Generally, solid mattes are
used to hold out keying in areas you want to remain opaque, such as someone with blue eyes
against a blue screen.
Enabling Invert inverts the solid matte before it is combined with the source Alpha.
Garbage Matte
Garbage mattes are mask nodes or images connected to the garbage matte input on the node.
The garbage matte is applied directly to the Alpha channel of the image. Generally, garbage
mattes are used to remove unwanted elements that cannot be keyed, such as microphones and
booms. They are also used to fill in areas that contain the color being keyed but that you wish
to maintain.
Garbage mattes of different modes cannot be mixed within a single tool. A Matte Control node
is often used after a Keyer node to add a garbage matte with the opposite effect of the matte
applied to the keyer.
Enabling Invert inverts the garbage matte before it is combined with the source Alpha.
Post-Multiply Image
Select this option to cause the keyer to multiply the color channels of the image against the
Alpha channel it creates for the image. This option is usually enabled and is on by default.
Deselect this checkbox and the image can no longer be considered premultiplied for purposes
of merging it with other images. Use the Subtractive option of the Merge node instead of the
Additive option.
For more information on these Merge node settings, see Chapter 32, “Composite Nodes” in the
Fusion Studio Reference Manual or Chapter 80 in the DaVinci Resolve Reference Manual.
Common Controls
Settings Tab
The Settings tab in the Inspector is also duplicated in other Matte nodes. These common
controls are described in detail at the end of this chapter in “The Common Controls” section.
Matte Control [MAT]
The MatteControl node
Matte Control Node Introduction
Keyer nodes are used to create an Alpha channel on an image that does not have one.
The Matte Control node is used to combine and manipulate the Alpha channels embedded in
images as well as masks created by masking tools.
Typically, you add this node to copy a color channel or Alpha channel from the foreground input
to the background input, or to combine Alpha channels from the two images.
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