NewTek TriCaster Studio - Manual (Page 98)

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The Contract/Expand knob fine-tunes the key by allowing you to contract or expand the matte.
(Contract is very also helpful in removing artifacts in compressed video.)
Contracting too much can erode fine detail, such as wispy hair; aggressive expansion can result in
the key color reappearing in places. Size X and Y provide independent control over vertical and
horizontal expansion and contraction.
The term Spill refers to key color unintentionally reflected (or
spilled) onto the foreground subject. It’s not unusual for a little
green spill to occur on the shoulders of someone in a greenscreen
setting, for example.
When enabled, Spill lowers the saturation of the key color in the
foreground, eliminating or at least reducing it.
When keying techniques are employed, it’s not unusual to find
unwanted inclusions in the background. The offending items
might be lighting or other set hardware, or something as simple
as a wrinkle in the greenscreen.
The Garbage Matte label owes its name to techniques used to
remove such unwanted ‘garbage’ from the scene.
Left, Right, Top and Bottom knobs control ‘matte cropping’, and
can ‘tighten in on’ the foreground subject, eliminating various
problems of this sort.
Hint: The best method for optimizing the key is to begin with the best incoming Connection Type
possible. Then, rotate all four knobs fully to the left (off) and adjust first Tolerance, then Edge
settings, Smoothness, and lastly Spill.
Figure 78
Figure 77