Using A Key To Composite Video; Compositing A Logo Or Image (Luminance Key) - Roland SR-20HD Reference Manual

Using a Key to Composite Video

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.

Compositing a Logo or Image (Luminance Key)

Black or white portions of a logo or image can be cut out based on
their brightness, and overlaid onto a background video. You can also
use a scene (p. 14) as the background video.
Adjusting the depth of compositing
1.
Output the video that you want to use as the
background video.
[MENU] button Ó "Key" Ó select "SW", and then press
2.
the [VALUE/CURSOR] knob.
3.
Turn the [VALUE/CURSOR] knob to select "On", and
then press the [VALUE/CURSOR] knob.
The composited result is output.
4. Turn the [VALUE/CURSOR] knob to select "Key Source
Ch", "Key Color", "Key Level", or "Key Gain", and then
press the [VALUE/CURSOR] knob.
ÃKey Source Ch
Select the source of the logo or image that you want to
superimpose.
Value Explanation
HDMI IN 1, 2 Video being input from the HDMI IN 1, 2 connectors
STILL 1, 2
A still image loaded into the unit (p. 19, p. 21)
ÃKey Color
Choose "BLACK" or "WHITE".
Value Explanation
Composite using luminance key.
Black
Makes black portions transparent according to
brightness.
Composite using luminance key.
White
Makes white portions transparent according to
brightness.
Composite using chroma key.
Green 1–3
Makes green portions transparent according to hue.
Composite using chroma key.
Blue 1–3
Makes blue portions transparent according to hue.
Background video Logo or image to be overlaid
Black or white
ÃKey Level
Adjusts the degree of extraction for the key.
ÃKey Gain
Adjusts the degree of edge blur for the key.
5. Turn the [VALUE/CURSOR] knob to change the value
of the setting, and then press the [VALUE/CURSOR]
knob.
Set the various menu items while you watch the composited
result.
6. Press the [MENU] button to quit the menu.
Key compositing
1. Press the [KEY] button to turn key compositing on (lit).
The composited result is shown as a cut.
2. To turn off key compositing, press the [KEY] button
once again.
The background video returns as a cut.
Changing the size of the logo or image
When using key compositing, you can change the size and position
of the overlaid logo or image. Make these settings in the following
Key menu.
Menu item Explanation
Source Zoom Adjusts the zoom ratio.
Source Scaling Type Specifies the scaling type.
Manual Size H Adjusts the horizontal size.
Manual Size V Adjusts the vertical size.
Source Pos H
Adjusts the horizontal position.
Source Pos V Adjusts the vertical position.
Video Operations
17