Datavideo SE-4000 8-Channel 4K Video Switcher - Manual (Page 116)

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Note: Selection of CK Auto automatically calculates the best Hue & Luma values for the
current Keyer source.
The chroma keyer parameters are described below:

Hue: This parameter adjusts the color of the chroma key. A typical green screen value
will be around 120. Blue screen value will be around 240.

Luma: The Luma value relates to how bright or dark the selected key colour or hue is.

K Range (Key Range): Key Range sets the range of hues or colors (0 – 360 degrees)
that closely match the background color to be keyed. The user can start with a value
of 120 degrees and this value can be fine-tuned up or down depending on the setup
of the green or blue screen studio.