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FIGURE 134
The Input Settings tab also contains Proc Amp (processing amplifier) settings. Input
Proc Amp adjustments are applied after LiveMatte is processed, which can help when
composing greenscreen shots to match a background or LiveSet.
You may also notice that changes to Proc Amp settings affect stopped (or frozen)
sources, including live camera feeds.
A switch at the top of the Proc Amp control group toggles the feature on/off. Other
controls operate as follows:
Brightness: Adjustment range from -50 to +50 IRE (the default being 0). As
reference, the full luminance range of the visible portion of a video signal can be
thought of as ‘100 IRE units’ (named for the Institute of Radio Engineers) –
ignoring minor regional variations.
Contrast – Adjustment range
from 25 - 400% (default 100%).
Hue – Adjustment range between
-180° and +180°. Adjusts the
master color of the video signal
from the attached source,
swinging the entire image
through the color wheel’s
spectrum.
Saturation – Adjustment range
from 0-500%. Zero saturation
results in a ‘black and white’
picture; increased saturation
results in richer colors. High
saturation values can exaggerate
the color portion of the signal.
(Note that over-saturated colors
are considered illegal for broadcast
Proc Amp practices:
Whenever possible, it is best to
perform color adjustments at the
source or target device. For
example, it is preferable to calibrate
a camera's colors at the camera,
before sending the signal to
TriCaster. Doing so will yield
higher color precision.
TriCaster’s Proc amps are available
for occasions when no upstream
color correction is available.
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