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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. 21) or PinP (p. 33).
DSK layer is shown in front of other layers (
Ø
memo on p. 33).
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. 36)
Here’s how you can cut out text or 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. 37)
Here’s how 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. 39)
Uses alpha channels (areas which contain transparency data) to cut out still images and place them against
dierent background video as a composite.
Alpha channel
Background video
DSK video source
External key (p. 40)
This sets the key signal (the shape to be cut out) and the ll video (the video to be composited) separately. This
uses the key signal to cut out the ll video and superimpose it on the background video to create the composite.
Background video
Fill video source
Key source
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