Datavideo SE-4000 8-Channel 4K Video Switcher - Manual (Page 60)

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CK Setup
In CK Setup, the user will be able to find all the parameters needed to perform chromakeying
of the green or blue backdrop.
CK Auto: This function automatically calculates the best Hue & Luma values for the current
Keyer source. After applying the CK Auto effect, the result can be fine-tuned by adjusting the
Luma and Hue values.
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: This parameter adjusts the luma value of the chroma key