NewTek TriCaster 8000 - Manual (Page 240)

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SECTION 13.1 CHROMAKEYING
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.
For example, when you see a
television meteorologist in
front of a weather map, that
person is almost certainly
posed in front of a green
screen. The background is
‘keyed out’ and replaced by
computer generated imagery.
Of course, if you choose poor
settings, foreground areas may
inadvertently be cut away as
well. Good keying often requires judicious balance between ‘too much’ and ‘too
little’. Let’s consider the tools TriCaster provides to help you achieve a great result.
SECTION 13.2 MATTE
The term Matte refers to a black
and white representation defining
the transparent (background) and
opaque (foreground) parts of an
image during compositing.
Portions of the matte that are grey
are treated as semi-transparent,
which
is very useful in
progressively smoothing edges between foreground
source material and inserted background imagery.
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FIGURE 215