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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.
Keys are layered onto the background video signal
from the lowest numbered key to the highest.
Figure 1: Key Priority
Self Keys
A Self Key is a key in which the luminance, or
brightness, values of the key source are used as the
alpha for the key.
To Set Up a Self Key
A self key is set up by selecting the keyer and
video source you want to use, and adjusting the key
parameters.
Tip: You can return the clip and gain values to the default
settings by clicking Make Linear .
1. Click Navigation Menu > Live Assist >
MiniME
and select the MiniME ™ (
MiniME
X )
and key ( Key X ) that you want to set up.
2. Click Key Fill and select the video signal you
want to use for the key. The
Key Alpha
is
automatically set according to the key type and
auto key settings.
3.
Click
Self Key
.
4.
Use the
Clip
slider to remove lower-luminance
areas from the video image.
5.
Use the Gain slider to adjust the transition
between the video image and the parts of the video
image that are removed.
6.
Use the Transparency knob to adjust the
transparency of the key from opaque ( 0 ) to fully
transparent ( 100 ).
7.
Click Key Invert to reverse the polarity of the
key alpha so that the holes in the background are
cut by dark areas of the key alpha instead of bright
areas.
8.
Click a Keyer Mode button to override the
shaped setting for the key.
•
Normal — set to a linear keyer for an
unshaped source.
• Additive — set to an additive keyer for a
shaped source. The
Key Invert
function is
disabled in this mode.
• Full — set the alpha to fully opaque (white).
The Clip , Gain , Make Linear , and Key
Invert functions are disabled in this mode.
9.
Click
Mask
to apply a mask to the key.
Auto Select Keys
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.
To Set Up an Auto Select Key
An auto select key is set up by selecting the keyer and
video source you want to use, and adjusting the key
parameters. The pairing of the video and alpha video
signals is done when configuring video inputs. Refer
to the Setup Manual that came with your switcher for
information on setting up Auto Keys.
Tip: You can return the clip and gain values to the default
settings by clicking Make Linear .
1. Click Navigation Menu > Live Assist >
MiniME and select the MiniME ™ ( MiniME X )
and key ( Key
X
) that you want to set up.
2. Click Key Fill and select the video signal you
want to use for the key. The Key Alpha is
automatically set according to the key type and
auto key settings.
3. Click Auto Select .
Note: If you select a chroma key engine as the Key Fill ,
you will not be able to adjust the key parameters.
4.
Use the Clip slider to remove lower-luminance
areas from the video image.
5. Use the Gain slider to adjust the transition
between the video image and the parts of the video
image that are removed.
6. Use the Transparency knob to adjust the
transparency of the key from opaque ( 0 ) to fully
transparent ( 100 ).
12 • Keying — Carbonite Black UltraChrome User Manual (v1.0)