Chroma Matte - Datavideo SE-1200MU Instruction Manual

In the diagram, you will see that we recommend a minimum of four lights and we keep the subject more
than 1m away from the backdrop. It is always easier to get more even lighting if the subject is farther
away from the backdrop (no shadows). The foreground lighting on the subject will also vary according
to the effect that you are looking for.
8.2

Chroma Matte

by clicking the Hue degree value in the lower bar and entering the required number.
Certain colour hues can be found at certain angles on the colour palette. For example, Red is 0 degrees (12
o'clock position), Green is around 120 degrees (4 o'clock position) and Blue is approx. 240 degrees (8
o'clock position). Secondary colours such as, Yellow at 60 degrees, Cyan at 180 degrees and Violet at 300
degrees.
The Luma value relates to how bright or dark the selected key colour or hue is. The Luma value can be
adjusted by clicking the Luma Function value and entering a new value. 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.
This matte sets the center of colour
range that will be used for keying.
The Chroma Matte parameters and the
values are shown along the bottom of the
display below.
The Hue can be changed by clicking on
and dragging the crosshair around the
colour palette with the mouse pointer.
The Hue value can also be finely adjusted
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