Roland V-8HD HDMI Video Switcher and UVC-01 USB Capture Device Kit - Manual (Page 27)

27
Video Operations
Alpha key
Use alpha channels (areas which contain transparency data) to cut
out still images and place them against different background video
as a composite .
Still image
Alpha channel
Setting the DSK mode or a still image to composite
1 . Press the [MENU] button 0 ”DSK” 0 select “DSK
MODE” or “DSK SOURCE”, and press the [VALUE]
knob.
2 . Use the [VALUE] knob to change the setting as
shown below.
Menu item Explanation
DSK MODE ALPHA KEY
DSK SOURCE Select the still image with alpha channel.
3 . Press the [MENU] button to quit the menu.
Compositing using DSK
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 . Press the DSK [ON] button to turn on DSK
compositing (lit).
The DSK [ON] button lights up in red, and the composition results
is sent to final output.
4 . To turn off DSK compositing, press the DSK [ON]
button once again.
MEMO
5 The fade time over which the still image appears or disappears
when you press the DSK [ON] button is specified by the setting
of the TRANSITION TIME menu item “DSK TIME”.
5 By holding down the DSK [PVW] button and pressing the
[MENU] button, the DSK menu appears.
5 You can make DSK/PinP composition (p. 19) turn on/off in
tandem with the video transitions.
& “Turning PinP/DSK composition on/off in tandem with
video transitions” (p. 13)
After step 2, use the [AUTO] and [CUT] buttons or operate the
video fader to switch the video. DSK composition turns on, and
the composited result that is previewed is sent to final output.
5 If the DSK mode is set to “alpha key” or “external key” (p. 28),
the same video that’s sent to the PGM bus is also sent to the
AUX bus (p. 16).
* This disables the AUX [1]–[8] button selection (the buttons
go dark).
Compositing a Still Image with Alpha Channel