NewTek TriCaster 2 Elite (3 RU) - Manual (Page 160)

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13.2.6 STRENGTH
LiveMatteULRA uses a different method to define its matte, basically discriminating between background
and foreground regions. Raising the
Strength value can loosely be thought of as more aggressively defining
imagery as background. As with ‘tolerance’ in the classic LiveMatte, the lowest effective value is what you’re
after with this setting.
13.2.7 OFFSET
The Offset setting is unique to LiveMatte Ultra, and can be thought of as boosting the opacity level of partially
transparent areas in your scene. Raise this value judiciously to solve problems with transparency in
‘borderline’ foreground regions.
SECTION 13.3 SPILL SUPPRESSION
The term ‘Spill’ refers to key color unintentionally reflected or ‘spilled’ onto the foreground subject. For
example, a little green spill often appears on the shoulders of someone in a greenscreen shot. Both variants
of LiveMatte offer
Spill Suppression , with
FIGURE 178
The Spill Suppression controls let you remove key color spill in your scene by reducing the amount of that
color in the foreground, where it doesn’t belong. The net result is that the impression of spill color is
eliminated, or at least reduced to the point where it is not objectionable. Use the Tolerance and Smoothness
controls (or, for LiveMatte Ultra, the Strength setting) in the Spill Suppression grop in similar fashion to the
controls by the same name discussed earlier. Endeavor to subdue spill without overdoing it, which can
sometimes produce an unwanted gray fringe around foreground edges.
SECTION 13.4
COMPOSITING
When you enable (and configure) LiveMatte for an input, the onscreen monitor for that input shows the
source keyed over a checkerboard pattern (when the Checkerboard option is selected in Overlays for the
monitor.)
If you select the ( LiveMatte -enabled) input as Input A in an M/E tab in LiveMatte mode , the keyed source is
overlaid on sources in lower input rows. You will see the composite result when the output is assigned to
either the
PGM or Preview row.
SECTION 13.5
FINE TUNING
You’ll find LiveMatte easy to configure with a little experimentation – but a few handy workflow tips follow
below. You may find it useful initially to turn Smoothness off or nearly so. Likewise begin with a low value