Specifications

considered part of the Foreground area. These are
typically the pixels near the edge of the foreground,
where it blends into the background.
• Foreground — Foreground elements are those
pixels that are not within the Background, Shadow,
Translucency, or Transition ranges. This is the area
with colors that will not be keyed out and will
remain solid.
The remaining three adjustments that can be made to an
Advanced UltraChrome chroma key allow you to adjust
spill suppression, edge softness and luminance.
• Spill Suppress — Spill Suppression elements are
those pixels in the Foreground that have a
noticeable tint of the Background color. This
typically occurs around the edge of the foreground
subject as glow from the background blue-screen
or green-screen “spills” onto them.
• Edge Softness — Edge Softness lets you apply
varying degrees of softening to the Foreground
edges to help it blend in with the underlying
background image that it is being keyed over.
• Luminance — Luminance allows you to control
the overall brightness of Shadow, Translucency,
and Transition areas as well as partial reections
to more closely match the Foreground brightness.
To Set Up a Chroma Key in Advanced 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 rst, and then identify
the areas where you need to adjust the key.
1.
Select the keyer that you want to set up a basic
Chroma Key.
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 Adv.
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 Init knob is pressed, the switcher
resets all the Chroma Key parameters to their
default settings.
7.
Press NEXT.
8.
Adjust the Background as follows:
a)
Use the Type knob to select Bkgd.
b)
Use the Cntrl knob to select NegHue.
c)
Use the Value knob to adjust the range of
hues that are included in the Background,
expanding counter-clockwise around the
color wheel.
d)
Use the Cntrl knob to select PosHue.
e)
Use the Value knob to adjust the range of
hues that are included in the Background,
expanding clockwise around the color wheel.
f)
Use the Cntrl knob to select Sat.
g)
Use the Value knob to adjust the saturation
range of the background color.
• Increasing the Saturation Range value
includes a wider range of saturation
values to be included in the
background.
• Decreasing the Saturation Range value
includes a narrower range of saturation
values to be included in the
background.
9.
Adjust the edges of the foreground as follows:
a)
Use the Type knob to select Edge.
b)
Use the Cntrl knob to select Sens.
c)
Use the Value knob to set the edge
sensitivity.
•
Low — Reduces the level of detail in
the edges of the chroma key as well as
the overall noise in the key image that
can be the result of certain lighting
conditions or high detail camera
settings. This is the default setting.
•
High — Include the maximum detail
in the edges of the chroma key.
d)
Use the Cntrl knob to select Soft.
e)
Use the Value knob to add or remove edge
softening of the foreground image and alpha
channel.
• Increasing the Softness value increases
the amount of softness applied to the
foreground edges and alpha channel.
• Decreasing the Softness value
decreases the amount of softness
applied to the foreground edges and
alpha channel.
10.
Adjust the Foreground Area as follows:
Carbonite Operation Manual (v8.0) — Keying • 33