GRASS VALLEY zodiak, User Manual

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Zodiak User Manual 385
Chroma Key Operating Notes
Other Chroma Key Controls
Additional chroma key controls are available by touching the stage 4
Other
data pad ( Figure 261 ). Coring, fringe, and shadow controls can be individ-
ually activated by touching the labeled buttons.
Figure 261. Other Controls
Coring
replaces any pixels in the luminance signal after primary suppression
that are below the adjustable threshold with black. This eliminates noise
resulting from incomplete suppression. While coring can improve some
keys, it can easily be over done. Coring thresholds much above black will
affect dark grays that are actually part of the foreground subject, making
the chroma key composite look unnatural.
Fringe
is used to restore color to the gray portions of the foreground color
resulting from secondary suppression adjustments. This control is only
active when secondary suppression is on.
Shdw
provides controls of shadows that fall on the backing.
Shadow Clip
and
Shadow Gain
allow selecting the range of the luminance portion of the fore-
ground that produces a shadow.
Shadow Density
is an opacity control for the
shadow and adjusts how much shadow is added to the background.