Grass Valley 1200 Operation Manual - Manual (Page 64)

3-18
Section 3 — Controls & Menus
Key Source Type: Video Key and Auto Select Key
The [VIDEO KEY] and [AUTO SELECT KEY] pushbuttons select the
type of key source that will cut a hole in background video to
create a key effect. Only one of these buttons may be on at a time.
The [VIDEO KEY] button enables a self key in which the fill video
selected on the Key bus serves as its own key source.
The [AUTO SELECT KEY] pushbutton enables automatic key source
selection for the fill video that you have selected on the Key Bus.
In this mode, you select the fill video crosspoint, and the source
that will be used automatically is the one that was preassigned for
use with that fill video in the configuration menus.
Split Key
You can do a split key (use different fill and source crosspoints)
for either key source type. To split the key:
■ Select a Key bus fill [CROSSPOINT].
■ Turn on and hold down either the [VIDEO KEY] button or the
[AUTO SELECT]
button. [VIDEO KEY] uses the fill from the
second Key bus crosspoint that you select as the key source.
[AUTO SELECT]
uses the auto select key source from the second
crosspoint that you select as the key source.
■ Select another Key Bus [CROSSPOINT] to serve as the key
source.
The split source crosspoint lights when you select it, and lights
whenever you hold down the [VIDEO KEY] or [AUTO SELECT]
button. In addition, the Split Key lamp turns on to indicate a split
key.
To turn off a split key, press any Key bus [CROSSPOINT], or turn off
the current key source type by pressing the other source type
button.