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Pre-Matte Range
These R,G,B, and Luminance range controls update automatically to represent the current color
selection. Colors are selected by selecting the Ultra Keyer node’s tile in the node tree and dragging
the Eyedropper into the viewer to select the colors to be used to create the matte. These range
controls can be used to tweak the selection slightly, although selecting colors in the viewer is all that
is required.
Lock Color Picking
This checkbox prevents accidentally selecting more colors from the view. It is a good idea to activate
this checkbox once the color selection is made for the matte. All other controls in the node
remain editable.
Pre Matte Size
The Pre Matte Size control can be used to soften the general area around the keyed image. This is
used to close holes in the matte often caused by spill in semitransparent areas of the subject. This can
cause a small halo around the subject, which can be removed using the Matte Contract tools found
later in the tool.
Reset Pre Matte Ranges
This discards all color selection by resetting the ranges but maintains all other slider and
control values.
The Ultra Keyer Image tab
Image Tab
The Image tab handles the majority of spill suppression in the Ultra Keyer. Spill suppression is a form of
color correction that attempts to remove the screen color from the fringe of the matte.
Spill is the transmission of the screen color through the semitransparent areas of the alpha channel. In
the case of blue- or green-screen keying, this usually causes the color of the background to become
apparent in the edges of the foreground subject.
Spill Suppression
When this slider is set to 0, no spill suppression is applied to the image. Increasing the slider increases
the strength of the spill method.
Spill Method
This selects the strength of the algorithm used to apply spill suppression to the image.
– None: None is selected when no spill suppression is required.
– Rare: This removes very little of the spill color and is the lightest of all methods.
Chapter 107Matte Nodes 2112
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