User Manual

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.
Luma Keyer [LKY]
The LumaKeyer node
Luma Keyer Node Introduction
The Luma Keyer node uses the overall luminance of an image to create an Alpha channel. The
label of this node may seem misleading since it allows pulling mattes from almost any channel.
In some respects, it is more accurate to call this node an all-purpose channel keyer, but its
primary purpose is for extracting alpha channels based on luminance
Inputs
The Luma Keyer node includes four inputs in the Node Editor.
–
Input: The orange input accepts a 2D image that contains the luminance values you
want to be keyed for transparency.
–
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. The garbage matte is applied directly to the Alpha channel of the image.
–
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.
–
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 luminance key occurs. An effects mask is applied to
the tool after the tool is processed.
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