NewTek 3Play 4800 - Manual (Page 119)

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. 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: 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 Display 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. (Some
cameras lack built-in color controls. At other times the physical placement of a device can make
access inconvenient).
WHITE BALANCE
To automatically white balance a source, click and hold the mouse button over the Color
(eyedropper) button, and then slide the pointer on the monitor for the corresponding source.
Release the mouse button over a part of the image that should be white.