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MULTICAM
By default, each camera with Auto Color enabled is processed uniquely – without reference to other sources.
Often, though, even greater consistency can be achieved by treating sources in similar illumination
environments as a group. Enable Multicam for several cameras causes Auto Color to evaluate and adjust
these cameras in unison. You might, for example, enable Multicam for court-side cameras in an interior
sports venue, while treating exterior or studio feeds individually.
LISTEN ONLY
The Listen Only switch allows you to include a source in the Multicam group without adding its own feed to
the group evaluation. Thus a camera trained on a giant purple dinosaur can be automatically corrected
without disproportionately biasing the group evaluation and consequent Auto Color correction.
Alternatively, one might enable Multicam for a number of sources, turning Listen Only on for all but one
camera – effectively making that camera the color reference all other cameras in the group will follow.
Note: The Proc Amp, discussed next, is downstream of the Auto Color system. This allows you to apply
further manual color adjustments to your individual sources, whether for fine tuning or to achieve a specific
“look”.
PROC AMP
FIGURE 8-4
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 transmission, and may result in
display problems on some devices.)
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