NewTek TriCaster 2 Elite (3 RU) - Manual (Page 157)

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Chapter 13 LIVEMATTE
Although its controls are deceptively simple, the LiveMatte™ feature employs powerful
chromakeying technology capable of extremely high-quality results. Used alone or in
conjunction with DSKs, M/E Overlays and LiveSet features, you will find LiveMatte can
play a ‘key’ role in your live productions.
As we mentioned earlier,
chromakeying
– or simply “keying” –
is used to combine images by
eliminating a portion of a
foreground image (effectively
cutting a digital ‘keyhole’ in it) to
reveal another background. This
method is also used to insert talent
seamlessly into virtual sets via
LiveSet ™.
LiveMatte ™ controls are located in an
expandable group in the Image tab of
the Input Configuration panel for
each Switcher source. To access
them, click the Configure button
(gear) that appears above an
onscreen monitor in the
All Monitors tab.
The method by which part of the image is defined as transparent is generically referred to as chromakeying,
for its dependence on the color values (chrominance) of the video stream. (LiveMatte
’s mature algorithms
far exceed typical chromakeying techniques to provide real-time results , but for our discussion it’s not
necessary to get into all of the details; suffice to say it works very well, and is easy to configure.)
Hint: Crop controls in the Input Settings tab can serve as a ‘garbage matte’ tool for chromakey sources.
SECTION 13.1
UNDERSTANDING KEYING
Chromakeying has become an essential tool in video and
film production. Typically, foreground footage is shot in
front of a blue or green screen, and then that background
color
– the key color – is treated as transparent, allowing
another image to be inserted.
FIGURE 173
FIGURE 174