Datavideo SE-4000 8-Channel 4K Video Switcher - Manual (Page 61)

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K Range (Key Range): Key Acceptance 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.
K Fgnd (Key Foreground): Key Foreground adjusts the performance of the chroma key in light
or white areas. Apply more Key Foreground if the light areas are becoming too transparent.
K Bgnd (Key Background): Key Background adjusts the performance of the chroma key in dark
or black areas. Apply more Key Background if the dark areas are becoming too transparent.
Hi-Light: Hi-light boosts the foreground key in high luminance area.
Lo-Light: Lo-light boosts the foreground key in low luminance area.
Bg-Supp: Background Suppress removes the Luma (Brightness) of the background from the
final image. Bg-Supp turns ON/OFF background suppression.
Left: Trims the left edge of the key object.
Right: Trims the right edge of the key object.
Soft: Determines the distinctiveness of key edge
Mask
The Mask feature basically shrinks the camera image by removing the borders from the final
image. This feature allows the user to configure the Mask in chroma, luma or linear mode.