NewTek TriCaster 300 - Manual (Page 183)

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The Spill controls, when enabled, 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 it is eliminated, or at
least reduced to the point where it is not objectionable.
Use the Tolerance and Smoothness controls under Spill Suppression in similar fashion to the
controls by the same name discussed earlier. Endeavor to subdue spill without overdoing it,
which could result in an unsightly gray fringe around offending edges of your foreground.
11.4 CROP
It is very common for a greenscreen shot to have unintentional inclusions that really need to be
removed along with the background, but which remain after the base chromakey process is
applied.
Figure 158
Common examples include microphones or lighting fixtures dangling from above, or perhaps a
harsh crease, blemish or tear in the background screen. Or, as is frequently the case, the source
video itself may have a few pixels of black or video ‘noise’ along one or more of its edges.
Cropping can be used to remove such unwanted ‘garbage’ from the scene, or it can be used
independently for other purposes – such as to isolate some portion of the screen for use as a
Picture in Picture overlay source.
Essentially, the four numeric controls in this group allow you to define independent margins for
the frame. Drag left or right on the number fields to adjust the values interactively, or double-
click (or right-click) a field to type a value using the keyboard. The region defined by these four
controls will be completely cropped.
Hint: For added convenience, similar cropping tools are available separately in the Position panels
of Overlay channels and Virtual Inputs.