Roland V-8HD HDMI Video Switcher and UVC-01 USB Capture Device Kit - Manual (Page 22)

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Video Operations
About DSK Mode
There are three DSK composition modes, “self key”, “alpha key” and “external key”.
The following video compositing is available according to the DSK mode.
Self key Luminance key (p . 23)
You can cut out text or an image by turning its black or white portion transparent, and then
superimpose it on the background video.
Black or white
Background video DSK video source
Chroma key (p . 25)
You can cut out a video by turning its blue or green portion transparent, and then superimpose it on the
background video. You can select a color from the video material to set as the key color.
Blue or green
Background video DSK video source
Alpha key (p . 27) Use alpha channels (areas which contain transparency data) to cut out still images and place them
against different background video as a composite.
Alpha channel
Background video DSK video source
External key (p . 28) Sets the key signal (the shape to be cut out) and the fill video (the video to be composited) separately.
This uses the key signal to cut out the fill video and superimpose it on the background video to create
the composite.
Background video
Fill video source
Key source
Compositing Video with Downstream Keyer (DSK)
Here’s how you can turn a portion of the video transparent and composite it with the background video. You can use luminance key with either a
black or a white background, or a chroma key with either a blue or green background.
You can additionally composite a variety of text and images with video that was composited using PinP or another method.