Roland VR-4HD HD AV Mixer - Manual (Page 24)

24
Video Effect Operations
Compositing Four Video Streams on a
Single Screen (QUAD)
This composites the input video on channels 1 through 4 into one
screen.
Channel 1 Channel 2
Channel 3 Channel 4
1.
Press the [QUAD] button to turn on video compositing
(making the button light up).
The input video on channels 1 through 4 is composited into one
screen.
2.
To turn off video compositing, press the [QUAD] button a
second time.
The [QUAD] button goes dark and normal output returns.
Compositing Using Key
This makes a portion of the video transparent and composites it onto
a background video.
With key composition on the VR-4HD, you can take video that has
been composited using Picture-in-Picture and the like, and further
composite it with text or other video.
KEY
For instance, you can carry out two-screen composition of live video
feed from two cameras, then use key composition to add a program
logo input from a computer.
Luminance Key
This takes video in which white or black areas are made transparent,
and composite it overlaid on a background picture.
Using luminance keying lets you superimpose logos or text on a
background picture.
Chroma Key
This composites video shot against a blue or green background onto a
different background video.
Blue or Green
Setting the Key Type and Extraction Color
To change the key type and extraction color to match the video you
want to composite.
Use the [SYSTEM SETUP] button
g to make the settings for the
following items.
Setting item Explanation
KEY TYPE
This selects between “CHROMA” (chroma key) or “LUMI”
(luminance key) as the key type.
CHROMA KEY
COLOR
This selects between “GREEN” or “BLUE” as the extraction
color for chroma keying.
LUMI KEY COLOR This selects between “WHITE” or “BLACK” as the extraction
color for luminance keying.