Key source button group, Key invert button, Show key button – Grass Valley Zodiak v.6.0 Mar 15 2006 User Manual
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Zodiak — User Manual
Section 3 — Control Surface Description
Luminance Key
The
Lum
button selects a Luminance key. The
Gain/Clip Hi
and
Clip/Clip Lo
knobs provide a full range control of clip and gain.
Key Source Button Group
The
Matte Fill
and
Video Key
buttons in the DSK Keyers subpanel determine
the source of the key cut and key fill for each key as explained below.
Matte Fill Button
The
Matte Fill
button determines what signal will be used as the key fill by
the keyer. When off, the key fill signal currently selected on the fill bus will
be used. When on, a matte signal will be used. Selecting the
Matte Fill
button
automatically delegates the Matte menu in the Menu panel. Matte adjust-
ments can only be made through this menu. Refer to
Video Key Button
The
Video Key
button determines what signal the keyer will use to cut the
hole in the background. When off, the key signal (if defined) of the source
selected on the cut bus will be used (the normal setting for a Linear key).
When on, the video signal of the selected source will be used (the normal
setting for a luminance key).
Note
Video Key is generally used only when the source's key signal is not appro-
priate. This would be the case for a character generator producing a wide key
(for a border or shadow) which the operator decides to matte fill. In this case,
the video signal defines the character area and usually produces a better
result.
Key Invert Button
The
Key Invert
button reverses the polarity of the key control signal. When
Key Invert
is active (button lit), black areas of the key cut signal cause replace-
ment of the background, and the white key cut areas cause the background
to be retained.
Show Key Button
The
Show Key
button is used for viewing the key control signal. This button
does not affect the Program output. Holding down this button displays the
black and white key control signal of the currently delegated keyer on that
M/E’s preview output. The results of any clipping and masking will be
shown.