Datavideo HS-4000 Instruction Manual page 130

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.
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