THOMSON GRASS VALLEY KayakDD-1, Руководство пользователя

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KayakDD - Digital Production Switcher
2.10.7 S-Shaped Key Signals
On the KayakDD system, an S-shaping function is applied to the edges of luminance
keys. S-shaping smooths the sharp corners of a luminance key control signal, which
helps prevent banding artifacts. S-shaping a signal minimally affects the key edges,
and does not move key thresholds or affect
the overall gain of the key.
Figure 12
S-Shaped Luminance Key Control Signal
S-shaping is generally not applied to linear keys because the external device usually
applies an S-shaping function when it generates the key cut and key fill signals. S-
shaping should not be applied twice.
2.10.8 Additional Keying Controls
The following additional controls are available for keying.
2.10.8.1 Key Invert
Keys can be inverted, causing holes to be cut in the background where a normal key
retains the background, and vice versa. Key invert makes the white areas of the key
cut signal produce transparency, and the black areas produce opacity, the opposite of
a standard key.
2.10.8.2 Masking
Masking defines areas that are protected from keying (Inhibit Mask) or always key
(Force Mask). The shape of the mask can originate from a wipe pattern generator or
by a selected mask signal (typically a key fill signal delivered via the Utility bus).
With the KayakDD Still Store, the mask signal can be a frozen page of video or a key
fill. Complex mask shapes are often easier to draw by hand than to create with multiple
wipe patterns.
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