Roland V-8HD HDMI Video Switcher - Manual (Page 22)

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Video Operations
Using Luminance Key
Luminance key
This cuts out text or an image by turning the black or white portion
transparent, and composites it onto the background video.
Black or white
Specifying the source and key type for the video
Specify the source and key type for the video that you want to
superimpose.
1 . Press the [MENU] button 0 ”DSK” 0 select “DSK
SOURCE” or “DSK TYPE,” and press the [VALUE]
knob.
2 . Turn the [VALUE] knob to change the value, and
press the [VALUE] knob.
DSK SOURCE
Select the source of the logo or image that you want to
superimpose.
Value Explanation
HDMI 1–8 INPUT 1–8 video
STILL 1–8 Captured still image 1–8
DSK TYPE
Choose “LUMINANCE-WHITE” or “LUMINANCE-BLACK.”
Value Explanation
LUMINANCE-WHITE
Composite using luminance key.
Makes white portions transparent
according to brightness.
LUMINANCE-BLACK
Composite using luminance key.
Makes black portions transparent
according to brightness.
3 . Press the [MENU] button to quit the menu.
Compositing using luminance key
1 . Output the background video.
At the PVW section of the monitor, check the video to be made
the background.
2 . Press the DSK [PVW] button to turn on the preview
output (lit).
The DSK [PVW] button lights up in green, and a preview of
the composition results is displayed in the PVW section of the
monitor.
At this stage, the final output has not yet been changed.
3 . Turn the DSK [LEVEL] and [GAIN] knob to adjust the
degree of effect applied.
Knob Explanation
[LEVEL]
Adjusts the degree of extraction (transparency) for
the key.
[GAIN]
Adjusts the degree of edge blur (semi-transmissive
region) for the key.
4 . Press the DSK [ON] button to turn on luminance key
composition (lit).
The DSK [ON] button lights up in red, and the composition results
is sent to final output.
5 . To turn off luminance key compositing, press the
DSK [ON] button once again.
MEMO
The fade time over which the logo/image appears or disappears
when you press the DSK [ON] button is specified by the setting of the
TRANSITION TIME menu item “DSK TIME.”
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.