NewTek TriCaster 2 Elite (3 RU) - Manual (Page 158)

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For example, when you see a tv meteorologist in front of a weather map, that person is almost certainly posed
in front of a green screen. The backgr
ound is ‘keyed out’ , to be replaced by computer generated imagery.
Of course, if you choose poor settings, foreground areas may inadvertently be cut away as well. Or, some
areas that should be transparent may be only partially keyed. Good keying often requires judicious balance
between ‘too much’ and ‘too little’. Let’s consider the tools provided 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.
LiveMatte supplies a digital version of this traditional tool. As you would expect, controls in this group allow
you to define and adjust the matte for the corresponding video input.
13.2.1 LIVEMATTE MODES
The Mode menu in the Keying control group lists several
optional keying methods. Each has its advantages, and
their controls differ as we will discuss next.
13.2.2 COLOR
All LiveMatte modes provide this control. Basically, you can think of LiveMatte as removing a specific color
from the foreground image. The base color removed is chosen using the Color button. Click on the Color
sample box, and keep the mouse button depressed. Then drag the eyedropper tool (mouse pointer) over one
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