Roland V-8HD HDMI Video Switcher - Manual (Page 24)

24
Video Operations
Chroma key
This cuts out a video by turning the blue or green portion
transparent, and composites it onto the background video. Using
this, you can composite only a subject that you are photographing
against a blue screen or green screen.
Blue or green
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,” “DSK TYPE,” or “COLOR,” 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
Set to “CHROMA.”
Value Explanation
CHROMA
Composite using chroma key.
Makes the specified key color transparent
according to hue.
COLOR
Specify either “GREEN” or “BLUE” as the key color for chroma key
(the color to be removed).
3 . Press the [MENU] button to quit the menu.
Compositing using chroma 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 chroma key
composition (lit).
The DSK [ON] button lights up in red, and the composition results
is sent to final output.
5 . To turn off chroma 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.”
Using Chroma Key