Figure 61

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.)

Hint: Proc Amp adjustments are also applied after LiveMatte is processed, which can help when composing greenscreen shots to match a background or LiveSet.

White Balance – to automatically white balance, click and hold the mouse button on the Color well, and then slide the ‘eyedropper’ pointer onto the monitor for the corresponding source.  Release the mouse button over a part of the image that should appear as white after processing.

Advanced Color Controls

Figure 62

This secondary control group is revealed when you click the triangle gadget beside its label.

In addition to per color channel (RGB) Brightness and Saturation sliders, it adds U Offset and V Offset controls.

  • The U portion of the video signal carries blue and yellow color information. Rotating the U Offset knob clockwise shifts the signal toward blue, while a counter-clockwise twist shifts the signal toward yellow.
  • The V portion of the video signal carries red and green color information. Rotate V Offset clockwise to shift the signal toward red and counter-clockwise to shift the signal toward green.

Hint: Your TriCaster system provides Waveform/Vectorscope monitors, an invaluable aid to calibrating


For more information please download the entire document at

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