User Manual

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 will invert 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.
Clean Plate
The CleanPlate node
Clean Plate Node Introduction
The Clean Plate tool is a pre-keying node used to generate an image of the green or blue color
screen to smooth out the lighting differences. The output of the Clean Plate is later connected
to the Clean Plate input on the Delta Keyer so it can key fine detail without choking or clipping
the matte.
How to Create a Clean Plate
Creating a clean plate is the opposite of creating a key. When keying, you try to remove the
green or blue color. When creating a clean plate, you try to keep as much of the blue- or
green-screen as possible. By box selecting areas of the screen color in the viewer, you end up
with an image of the green/blue screen. A transparent cutout represents everything that is not
part of the blue or green screen.
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