Datavideo SE-4000 8-Channel 4K Video Switcher - Manual (Page 56)

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Left – Left sets the left edge of the keyer mask.
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Right – Right sets the right edge of the keyer mask.
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Top – Top sets the top edge of the keyer mask.
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Bottom – Bottom sets the bottom edge of the keyer mask.
5.3 Chroma
The Chroma Keyer removes the green background of the key image. If Chroma is selected in
Keyer, this option menu allows you to configure the corresponding parameters.
Keyer
First, select the Keyer (Key 1, Key 2, Key 3 or Key 4) that has been set to the chroma key.