57
•
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 54
This secondary control group is revealed when you click the triangle gadget beside its label.
In addition to per color channel (RGB)
Brightness
and
Contrast
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.
