User Manual

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 rst, 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 Additv and the Value
knob to turn additive keying on or off.
•
Off — 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.
•
On — Include the maximum detail in the edges
of the chroma key.
9.
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.
• Decreasing the gain value causes the background
to appear more transparent. This results in more
of the background color being removed.
10.
Use the Type knob to select Edge and 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.
11.
Use the Type knob to select Foregd.
12.
Use the Cntrl knob to select Clip and use the Value
knob to adjust the foreground clipping.
• Increasing the clip value removes lower-saturated
colors from the foreground image.
Carbonite Black Solo Operation Manual (v1.2) — Keying • 31