Grass Valley 1200 Operation Manual - Manual (Page 53)

3-7
Crosspoint Buses
Key Bus
Key bus crosspoints select the fill video and key source used by
the delegated keyer to create a key. Each crosspoint can be
assigned a fill video and a key source via the configuration menus.
■ Before selecting a crosspoint, you must first delegate a keyer
by pressing the [KEY 1], [KEY 2], or [DSK] button in the Keyer or
Transition section. Then select a crosspoint and make any
other desired Keyer selections and adjustments.
■ When [VIDEO KEY] is on, the switcher does a self key: the fill
video you select on the Key bus also serves as the key source
(cuts the hole and fills it).
■ When [AUTO SELECT KEY] is on, you select the fill video
crosspoint on the Key bus, and the switcher will automatically
select the assigned key source.
■ You can also do a split key (use different fill and source
crosspoints): Select a Key bus fill [CROSSPOINT], hold down
the [AUTO SELECT KEY] or [VIDEO KEY] button, and select
another Key Bus [CROSSPOINT] to serve as the key source. The
fill button and SPLIT KEY lamp light up and remain lit; the
source crosspoint lights whenever you hold down the [AUTO
SELECT KEY]
or [VIDEO KEY] button.
A split key is temporary and does not change the key
assignments mapped in the configuration menus during
system setup. To cancel the split, press any Key bus
[CROSSPOINT]
or hold down [Auto Select Key] or [Video Key]
and press the fill [crosspoint].
■ Every Key bus crosspoint has Key Memory, if enabled in the
Keyer menu. When you select a crosspoint, Key Memory
restores the last keyer setup used for that crosspoint.
Remembered functions include key source type (Video or
Auto); key type (Linear, Luma, Chroma or Preset Pattern);
and the various control knob and menu settings.