Datavideo SE-4000 8-Channel 4K Video Switcher - Manual (Page 57)

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Select Fine if you require high keying quality and Normal for original keying quality.
Next, select one video source from all available options in Key Source.
Key Source
Assign a key source to the keyer selected.
Various options are listed below:

Bars: Color bars

Matte: A configurable color screen and the Matte value can be set in Matte option of
the Start menu

Input 1 – 8: Image source loaded to channel buttons 1 – 8

Black: Black Screen
Key Tie
Key tie is a feature that allows you to overlay a foreground image on a background image. The
key tie image can then be opened by pressing the corresponding input button of the
background image. Note that if key tie is enabled for a particular keyer, the corresponding
keyer button will be disabled.