Roland V-160HD SDI/HDMI Streaming Video Switcher - Manual (Page 30)

30
Video Composition Operations
Compositing Video with Downstream Keyer (DSK)
You can further composite titles, subtitles/captions and other video on video composited using split (p. 27) or PinP (p. 28).
There are two DSK series on the V-160HD. DSK layers are shown in front of other layers (
Ø memo on p. 28).
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. 31)
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. 33)
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. 35) 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. 36) 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