to remove lower-saturated colors from the video
image.
5.
Use the
Gain
knob to adjust the transition
between the video image and the parts of the video
image that are removed. 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
Transp
knob to adjust the transparency
of the key from opaque (
0%
) to fully transparent
(
100%
). Use the
Transparency
knob to adjust
the transparency of the key from opaque (
0
) to
fully transparent (
100
).
7.
Press
NEXT
.
8.
Use the
Invert
knob to reverse the polarity of the
key alpha (
On
) so that the holes in the background
are cut by dark areas of the key alpha instead of
bright areas. 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.
9.
Use the
Mode
knob to override the shaped setting
for the key. Click a
Keyer Mode
button to
override the shaped setting for the key.
•
Normal
— set to a linear keyer for an
unshaped source.
•
AddtveAdditive
— set to an additive keyer
for a shaped source. The
Make Linear
function is disabled in this mode.
Additive
—
set to an additive keyer for a shaped source.
The
Make Linear
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.
Note:
The mode is reset to
Normal
when a different
source is selected on the key bus or the alpha is
changed.
10.
Press
NEXT
.
11.
Use the
Mask
knob to apply a mask to the key.
Click
Mask
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 2 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.
UltraChrome 2 can work in two modes, depending on
the lighting conditions and subject matter used for the
chroma key.
•
HR Wedge Key
— Based on the standard chroma
keyer and discriminates between the color vector
angle and level of the background color vs the color
vectors and levels in the foreground components.
This produces very good results under ideal
conditions. However, if the scene includes high
detail luma content in edge regions, these may not
be included in the output.
•
HR Detail Key
— Differs from the standard
chroma keyer in that it adds luminance
dependency to a three-dimensional spherical color
discriminator. This chroma keyer can develop
subtle video and alpha shapes and discriminate
high detail luma content in edge transition areas.
However, this design may have problems with
content where background and foreground levels
are similar within the video itself.
Tip:
UltraChrome 2 also offers the option to combine these
two modes to offer good capture of high luma detail in the
edge regions as well as compensation for similar foreground
and background levels.
The UltraChrome 2 chroma keyer uses an independent
chroma key engine to produce the video and alpha
components of the key. These internal video streams
can be composited in an ME or MiniME
™
keyer, or fed
out two separate video streams to an external device,
such as a video server.
To Select the Chroma Key on a Keyer
The outputs of the chroma key engine must be selected
on a key bus to be properly keyed and to adjust the
chroma key parameters.
1.
Press the
KEY
X
SEL
button for the keyer that
you want to view the chroma key on.
2.
Press
AUTO SELECT
.
3.
Press the
CK
X
source button on the key bus for
the chroma key engine you want to use.
Note:
When you select the chroma key engine on a bus,
the key bus becomes assigned to that chroma key engine
so that you can select a source for the chroma key.
To Set Up a Chroma Key
Set up the chroma key with the source you want to use
and adjust the parameters. Ensure that the chroma key
output has been selected on a keyer so that you can
view the output as you adjust the parameters.
Carbonite Black Operation Manual (v14.0) — Keying •
33
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