Datavideo DVK­100 Mk II Instruction Manual page 25

Now we will set up the CAM­2 overlay, which has a black area we want to key out.
Press the CAM­1 button on the front of the DVK­100, once pressed it should be
illuminated red.
Press the Chroma Key button and the Luma button, both should be illuminated red.
Luma Key has two modes and you will see if you press and hold the Luma button for
two seconds it flashes. If the button is constantly red it is in Mode 1, which is for
removing dark colours – If it is flashing it is in Mode 2, which is for removing light
colours. As CAM­2 has a black background that we want to remove, we need Luma
Mode 1, so press the Luma button so that it is illuminated constantly red.
Use the Adjustment Knob to adjust the Luma Keying level. You should see the effect on
the output monitor. Set the Luma Keying Level to eliminate as much of the black
background as possible.
Overlay with Black Matte Area Overlay after Luma Keying Level
Adjustment
You can also apply Luma Key Mode 2 to fine tune the overlay. This will start to key out the lighter areas of
the overlay.
Press and hold in the Luma button for two seconds, until it starts flashing red.
Use the Adjustment Knob to adjust the Luma Keying level. You should see the effect on the
output monitor. The lighter areas of the overlay will start to disappear. This is really a fine tune
adjustment, if you go too far everything will appear.
Now press the Density (Level) button. The Chroma Key and Density buttons should both be
illuminated red. When using Luma Key, the Density button has two modes and you will see if
you press and hold the Density button for two seconds it flashes. If the button is constantly red
it is in Mode 1, which adjusts the density of dark colours – If it is flashing it is in Mode 2, which
adjusts the density of light colours. You can use both Modes 1 and 2 to fine tune the overlay
effect.
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