KayakDD - Digital Production Switcher
On the KayakDD system, Gain has a percentage value. A Gain value of 50% requires
a luminance change of 50% of the distance between black and white to produce a
keying signal ranging from transparent to opaque. A gain value of 100% (unity gain)
uses the entire range between black and white for this transparent to opaque
transition. A gain value of 0% produces the hard key edges (a high gain key).
2.10.6
Clip Hi and Clip Lo
The KayakDD system also supports a Clip Hi and Clip Lo mechanism. With Clip Hi and
Clip Lo, two thresholds are established. The upper threshold specifies at what point
video will be completely removed from the background, and the lower threshold
determines at what point background video will be retained completely intact.
igu 1
Clip and Gain
s more appropriate for low gain keys, to allow independent
control of the two thresholds. For example, when adjusting a linear key the operator
wants to control where the fill becomes opaque (Clip Hi) and where the fill becomes
transparent (Clip Low). In Clip Hi/Lo mode adjusting the point of opacity does not
change the point of transparency, and vice versa.
Clip, Gain, Clip Hi and Clip Low adjustments always interact. Changing one always
results in changes to two other values. Changing Clip Hi or Clip Low changes both Clip
and Gain, not just Gain.
F
re 1
Key Hi, Clip Lo vs.
In this mode, Gain changes when either control is adjusted. The difference between
the upper and lower keying thresholds is equivalent to gain:
•
Clip Hi = Clip + Gain/2
•
Clip Lo = Clip – Gain/2
Clip Hi and Lo control i
User Manual
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Summary of Contents for GRASS VALLEY KayakDD-1
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