User Manual

Gamma
This raises or lowers the values of the matte in the semitransparent areas. Higher values cause
the gray areas to become more opaque, and lower values cause the gray areas to become
more transparent. Completely black or white regions of the matte remain unaffected.
Threshold
Any value below the lower threshold becomes black or transparent in the matte. Any value
above the upper threshold becomes white or opaque in the matte. All values within the range
maintain their relative transparency values.
Restore Fringe
This restores the edge of the matte around the keyed subject. Often when keying, the edge of
the subject where you have hair is clipped out. Restore Fringe brings back that edge while
keeping the matte solid.
Invert Matte:
When this checkbox is selected, the Alpha channel of the image is inverted, causing all
transparent areas to be opaque and all opaque areas to be transparent.
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 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
Selecting this option multiplies 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.
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