Datavideo SE-1200MU 6-Input Switcher and RMC-260 Controller Bundle - Manual (Page 61)

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Chroma Key Output is showing Light Edges, then the Bgnd suppress can be used to suppress any
background Luma that is showing through on these edges.
The Opacity setting affects how transparent the foreground Chroma matte is.
MAC Users
The CK Setup sets the color that will be used for keying. The parameters and the values are shown along
the bottom of the display below.
Luma, Hue, and Opacity values define the color that will be used for keying..
The Luma value determines how bright or dark the selected color or hue is. The Luma value can be
adjusted by manually entering a value or clicking the red rectangle at the center of the blue screen. For
details on ways to set this value, see section
7.1.2 .
The Hue parameter determines the hue value of the selected color. The Hue value can be adjusted by
manually entering a value or clicking the red rectangle at the center of the blue screen. For details on
different ways to set this value, see section
7.1.2 .
The Bgnd Suppress or Background Suppress Control is used to remove the Luma (brightness) of the
background from the final image. If the Chroma Key Output is showing Light Edges, then the Bgnd
suppress can be used to suppress any background Luma that is showing through on these edges.
The Opacity setting affects how transparent the foreground Chroma matte is.
8.2 Chroma Key Ctrl
Windows PC Users
The Chroma Key Ctrl parameters and
values are shown along the bottom of the
display. Two color palettes,
Main and
Chroma, are shown in the diagram.
The Main palette corresponds to values of
Key Acceptance and Key Lift . The Chroma
palette corresponds to the Color Spill
settings.
Key Acceptance is represented on the
Main Palette as a sector or area covering a range of hues or colors that closely match the background color