Datavideo SE-4000 8-Channel 4K Video Switcher - Manual (Page 111)

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5. In this example, the text image is against a black background so reduce the Lift value to
remove the black background. Descriptions of the corresponding parameters are
described below:

Lift (0 – 100%) adjusts the dark/black areas of the key image. Reducing the value of
Lift will make dark areas of the key image more transparent. The background image
will be showing only through the transparent areas.

Gain (0.0 – 16.0) adjusts the light/white areas of the key image. Increasing the value
of Gain will make light areas of the key image more solid. The background image will
be showing only through the transparent areas.

Opac (0 – 100%) adjusts the transparency of the overall foreground image, which is
the text in this example. Increasing the value of Opacity will make the overall key
image less transparent.

Invert (On/Off) sets the luma key color; luma key color is white if turned ON and black
if turned OFF.
6. Set the “Lift” to 100% if the background is in total black.
7. Opaque logo can be created by setting the “Opac” parameter to 100%. Set “Opac” to 100%
if an opaque logo is desired. Semi-transparency effect can be generated by setting the
“Opac” parameter to a value between 0 and 100%.
8. In the Key Source sub menu, select an input source to which the luma key settings will be
applied. In this example, select “Input 3” since this is the corresponding input channel of
HDMI input port 9 to which the laptop is connected.
Note: Since “Self” is chosen, Fill Source can be ignored.