Datavideo DVK-400, Instruction Manual

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9. Set one of your outputs to “COMP” to show a combined view of the chromakeyed foreground
and the background video as shown in the diagram below.
5.2 Crop using Garbage Mask
After you apply a key, you may need to crop unwanted background elements that cannot be keyed,
such as (1) the screen edge, (2) lighting stands that appear in the background and (3) uneven
distribution of light. Using the Garbage Mask tool, you can create a garbage mask that removes
unwanted elements. See
Section 4.5 for instructions.
Open the composite view on one of the output monitors and you should be able to see a combined
view of the talent and the background as shown in the diagram below. Then activate the garbage mask,