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Section 2 — Control Panel Descriptions
Key Source Buttons
The VIDEO KEY and AUTO SELECT KEY buttons determine the
source of the key, or “hole cutter.”
Pressing the VIDEO KEY button forces derivation of the key from a
video source. The “video source” is the video selected on the key
bus (for Keyers 1 and 2) or on the background bus (for
background keyers in layered mode only).
If VIDEO KEY and VIDEO FILL are both selected, the result is a self-
key.
Pressing VIDEO KEY while in Chroma Key mode causes an
encoded chroma key, using the fill video as the source for the
encoded chroma keyer.
Pressing the AUTO SEL KEY button forces the key to be derived
from a user-defined source.
User preferences selected in the Configuration/User Preferences
menu determine whether a luminance or linear key is a self-key or
an external key (and determine which external key is used). They
also specify whether chroma keys are encoded or analog
component (YUV, BETA or RGB).
Split Key Operation
A Split Key uses any key source other than a key derived from the
key fill (self key) or a key source pre-selected in user preferences
or a preset pattern. Split Keys can be used in all keyers, in either
standard or layered mode.
A Split Key is set up by first selecting the key fill source on the Key
bus, then holding down the VIDEO KEY button or the AUTO
SELECT
button while pressing a second button on the key bus.
The second source provides the key signal. For AUTO SELECT that
key is the external key signal mapped to that column of crosspoint
buttons; for VIDEO KEY the key is the video signal mapped to that
column of crosspoints.
VIDEO
KEY
AUTO
SEL
KEY