Sony DVS-7300 User Manual page 266

Basic Chroma Key Operations
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Chapter 5 Chroma Keying
Press any of F4 to F8 to select the foreground video. In a D2 system,
however, F8 (KEY BUS) does not appear.
F4 (1) to F7 (4): input signal to one of the CRK INPUT connectors (CH
1 to CH 4) on the rear panel of the processor.
F8 (KEY BUS): signal selected on the key bus.
In a D1 system, if you selected F8 (KEY BUS), press F9 (FRGD
FORMAT) and select the format of the foreground signal.
422: 4:2:2 digital component signal
444: 4:4:4 digital component signal
Note
When using a key bus 4:4:4 format signal for the foreground, you must
first use a setup menu operation to allow two signals (a 4:2:2 format
signal ("LINK A") and a 0:2:2 format signal ("LINK B")) to be
combined and selected together by the cross-point button.
For details of the setup menu operation, see page 14-62.
Make the same preparations as for an ordinary key transition.
Select "KEY BUS" for both of the key fill and the key source, to carry
out self-keying.
In a D1 system, if you set F9 (FRGD FORMAT) to "444", select "KEY
BUS" for the key fill, and select "AUTO SELECT" for the key source.
Selecting the LINK A signal on the key fill bus automatically selects the
LINK B signal on the key source bus.
Carry out the transition, to insert the key.
For an optimum result carry out the adjustments in the next section
"Adjusting the Chroma Key Image" (next page). If necessary, see also
the sections "Video Signal Adjustment" (page 5-12) and "Chroma Key
Masking" (page 5-13)