NewTek TriCaster 300 - Manual (Page 147)

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 Selecting a Virtual Input on Program or Preview can bring more sub-layers into the BKGD
composite – Input A, B, and the dedicated Virtual Input Overlay. (This being so, the
BKGD layer alone can at times actually comprise up to seven sub-layers.)
8.3 TRANSITIONS
Immediately to the right of the Switcher rows is the Transitions section. This group of controls
and settings provides many creative and flexible ways to compose the video layers comprising
Program output.
Main Layer Controls Local Layer Controls
Figure 122
With video layers in mind, it’s easy to comprehend the philosophy underlying the Transition
control group.
The larger right portion of the Transition group provides local control and configuration options
individually for three of the four primary video layers, namely BKGD, DSK 1 and DSK 2.
We’ll consider the local controls first.