NewTek Tricaster TCXD850, User Manual, Page: 202 / 336

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Figure 172
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.
11.5 COMPOSITING
When you enable LiveMatte for an input, the onscreen monitor for that input continues to show
the source keyed over black. If you directly select that source on the Switcher’s Program or
Preview rows, you will see the result of compositing the input over the source selected on the FX
row.
Something similar will occur if you select the (LiveMatte-enabled) input as Input A in a Virtual
Input tab, and then select that on Program or Preview . In this case, Input A is overlaid on the
source you choose as Input B .