Datavideo SE-4000, Instruction Manual

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For luma keyers, the Invert button allows you to select the background color to be keyed.
When the Invert button is disabled, the luma keyer removes the black background; when
the Invert button is enabled, the luma keyer removes the white background.
DSK 1/2 are usually set to Linear keying mode which is chosen for professional graphic
design.
Adjust
Tap the Adjust button to set the Opacity, Lift and Gain parameters for the luma keyer.