NewTek 3Play 820 - Manual (Page 92)

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Hint: When the Proc Amp is enabled for a specific source, a small yellow indicator is displayed in
the upper-right corner, just above the corresponding monitor in any of the three main monitor
tabs. (This indicator is itself also a toggle switch.)
Each Proc Amp has numeric slider controls for:

Brightness: Adjustment range from -50 to +50 IRE (the default being 0). As reference,
the full luminance range 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 from -180° to +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.
(You should be aware that over-saturated colors are considered illegal for broadcast
transmission, and may result in display problems on some devices. )
Note: The input and output Proc Amps are very useful. However, keep in mind that, 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 the 3Play™ system. Doing so will yield higher color precision. Similarly, it’s often better
to adjust output color using controls on down-stream monitors. (The output Proc Amps can never
completely compensate for a badly calibrated monitor.)
The Proc amps are especially useful for occasions when no external options are available (many
cameras lack built-in color controls; at other times, the physical placement of a device can make
access inconvenient).