Keying
Keying is the term used to describe when you
insert (or electronically cut) portions of one
scene into another, or place titles over
background images. Keys are made up of two
basic components, an alpha, that cuts the hole
in the background video, and a fill, that fills the
hole with different video. Depending on the type
of key, the alpha signal can be from an external
source, or internally generated.
Keys, like MEs, are layered onto the background
video from the lowest number key to the highest
number key on the ME by default.
Self Key
A Self Key is a key in which the luminance, or
brightness, values of the key source is used as
the alpha for the key.
To Set Up a Self Key
1.
Press the
SEL
button on the Keyers module
for the key you want to set up and select a
video source on the Key bus.
Tip:
The SEL button allows you to quickly select the keyer
you want to work with and assign the Key bus to the keyer.
On the Double-Down control panel, the top button row is
assigned to the even numbered keyers (2,4,6) and the
button row below is assigned to the odd numbered keyers
(1,3,5). This can be changed with the DD Key Delegation
personality option.
2.
Press
SELF KEY
.
3.
Press
Clip/Gain
and use the
Clip
and
Gain
knobs to adjust the clip and gain of the key.
•
Clip
— remove lower-saturated colors
from the video image.
•
Gain
— adjust the transition between the
video image and the parts of the video
image that are removed.
Tip:
You can return the clip and gain values to the default
setting by pressing Make Key Linear.
4.
Press
Trans Rate
and use the
Trans Rate
knob to set the independent key transition
rate.
5.
Toggle
Transparency
to
On
and use the
Transp.
knob to adjust the transparency of
the key from opaque (
0%
) to fully
transparent (
100%
).
6.
Toggle
Additive
to temporarily override the
shaped/unshaped key settings for the
selected source.
•
On
— turn shaped keying on for the
source.
•
Off
— turn unshaped keying on for the
source.
Auto Select Key
An Auto Select Key is a key in which two video
signals are required to make the key. The Alpha
is used to cut the hole in the video and the fill
is used to fill the hole. These signals often
originate from external devices such as
character generators, external still stores, or
other graphics systems.
An auto select key is set up by selecting the key
and video source you want to use, and adjusting
the key parameters. The pairing of the video
and alpha video signal is done when configuring
video inputs. Refer to the Setup Manual that
came with your switcher for information on
setting up Auto Keys.
To Set Up an Auto Select Key
1.
Press the
SEL
button on the Keyers module
for the key you want to set up and select a
video source on the Key bus.
Tip:
The SEL button allows you to quickly select the keyer
you want to work with and assign the Key bus to the keyer.
On the Double-Down control panel, the top button row is
assigned to the even numbered keyers (2,4,6) and the
button row below is assigned to the odd numbered keyers
(1,3,5). This can be changed with the DD Key Delegation
personality option.
2.
Press
AUTO SELECT
.
3.
Press
Clip/Gain
and toggle
Key Mem
to
Off
.
When key memory (
Key Mem
) is on, you
cannot adjust the clip and gain settings.
4.
Use the
Clip
and
Gain
knobs to adjust the
clip and gain of the key.
•
Clip
— remove lower-saturated colors
from the video image.
•
Gain
— adjust the transition between the
video image and the parts of the video
image that are removed.
Tip:
You can return the clip and gain values to the default
setting by pressing Make Key Linear.
Ultrix Acuity Operation Manual (v10.1) — Keying • 41