•
Normal
— use the shaped/unshaped setting
from the key setup.
•
Addtve
— set to an additive keyer for a
shaped source.
•
Full
— set the alpha to fully opaque (white).
The
Clip
,
Gain
,
Make Linear
, and
Key
Invert
functions are disabled in this mode.
Note:
The mode is reset to Normal when a different
source is selected on the key bus, the alpha is
changed, or a memory is recalled.
10.
Press
NEXT
.
11.
Use the
Mask
knob to apply a mask to the key.
The Auto Select key uses the pre-assigned Auto Key
association to select the proper video and alpha. If you
want to temporarily select a different video source for
the alpha, press and hold the
AUTO SELECT
button
and select the video source you want to use as the new
fill.
UltraChrome Chroma Key
An UltraChrome Chroma Key is a key in which the hole
is cut based on a color value, or hue, rather than a
luminance value or alpha signal. The color is removed
and replaced with background video from another source.
The default color is blue.
Chroma Key adjustments are persistent and are not
affected by a soft reset or switcher reboot. However,
initializing the Chroma Key or performing a factory reset
returns all adjustments to default values.
Chroma Key Modes
The UltraChrome Chroma Key operates in one of two
modes, Basic or Advanced, depending on the complexity
of the Chroma Key you are setting up.
•
Basic Mode
— In basic mode, UltraChrome
provides a simple background/foreground chroma
key with adjustment for background spill and edge
softness.
•
Advanced Mode
— In advanced mode,
UltraChrome provides advanced background
shadow and translucency control, as well as control
over background/foreground transition areas.
Although it is possible to switch back and forth between
advanced and basic mode, the additional image correction
of the advanced mode is only applied in the advanced
mode. For example, if you use the basic mode to set up
the Chroma Key and then switch to the advanced mode,
the entire image may change as the image correctors
provided by the advanced mode are applied at their
default settings.
Chroma Key Basic Mode
The following chroma key parameters can be adjusted
in Basic Mode:
•
Background Gain
— Allows you to modify the
range of colors that are considered background and
are masked out of the Chroma Key.
•
Edge Softness
— Allows you to adjust the amount
of edge softening applied to the foreground. This
helps blend the foreground into the new
background.
•
Foreground Clip/Hue/Reject
— Allows you to
modify the range of colors that are considered
foreground and are not masked.
•
Spill Range
— Allows you to remove background
color casts that may spill into the foreground image
(green color cast on the foreground from a
green-screen for example).
To Set Up a Chroma Key in Basic Mode
The UltraChrome chroma key tries to automatically
adjust for the scene you are trying to chroma key. For
the best results, initialize the key first, and then identify
the areas where you need to adjust the key.
1.
Select the keyer that you want to set up an
Chroma Key on.
Note:
You can use the same procedure for a
MiniME
™
.
2.
Select the video signal, on the key bus, that you
want to use for the key.
3.
Press
CHR KEY
.
4.
Use the
Mode
knob to select
Basic
.
5.
Use the
Color
knob to select the color you want
to key out.
6.
Press the
Init
knob to initialize the chroma key.
Every time the key is initialized, the switcher
resets all the Chroma Key parameters to their
default settings.
7.
Press
NEXT
.
8.
Use the
Type
knob to select
Bkgd
and use the
Value
knob to adjust the background gain.
•
Increasing the gain value causes the
background to appear more opaque. This
results in less of the background color being
removed.
34
• Keying — Carbonite Operation Manual (v10.1)
