NewTek TriCaster 300 - Manual (Page 159)

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Right beside the Program monitor, the Live Desktop also displays the Look Ahead Preview
monitor (labeled simply Preview) surmounted by a green tinted titlebar).
The Look Ahead Preview is versatile and powerful. Instead of
showing just one video source (the Preview row selection), it
displays the composite result of a Take operation applied to all
currently delegated video layers (see the sub-heading
Transition Delegates in Section 0).
IN OTHER WORDS, ‘WHAT YOU SEE IS WHAT YOU WILL GET’
AFTER A TAKE OR AUTO OPERATION.
This allows you to set up the next
shot, check its composition (including
titles and overlay positioning), and
switch to it with sublime confidence.

Selecting the BKGD delegate tells TriCaster™ you intend the next transition to swap the
Program and Preview layers. The Preview monitor will show the Preview row selection
as its background.

When the BKGD delegate is not active, the BKGD layer will not change during a
transition. Consequently, in this case the Preview and Program monitors share identical
backgrounds.

Delegated DSK layers are shown above the background on Preview according to their
current state. That is, if a delegated DSK layer is currently displayed on Program output
it does not appear on Preview – since the next transition would remove it.
When BKGD is delegated alone, Take, Auto
and Preview work just as in other TriCaster
models.
A green titlebar always highlights the Preview
monitor.
Figure 134