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FIGURE 8-6
The process involves eliminating a portion of the image (effectively cutting a digital ‘keyhole’ in it) to reveal
a user-defined background scene. It also plays an important role in the workflow of LiveSet, TriCaster’s
powerful virtual set technology.
LiveMatte’s controls are deceptively simple, making a great deal of complex digital manipulations easy to use.
Even so, much can be said about getting the best results. For that reason we’ve devoted a whole chapter in
this manual to discussing it – please see Chapter 13, LiveMatte .
Hint: When LiveMatte, Proc Amp, or Crop settings are active for a source, bright green, blue and yellow
indicators are lit under its monitor.
8.1.4 EDGES
It is very common for a source to be supplied with unintentional inclusions; these are often items that remain
after chromakeying is applied, but which need to be removed along with the background. (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 settings in the Edges control group can be used to remove such unwanted ‘garbage’ from the scene,
or used independently for other purposes – such as to isolate some portion of the screen for use as a ‘Picture
in Picture’ overlay source.
FIGURE 8-7
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