• Decreasing the Reject value increases the amount
of adjacent hues that are included in the
foreground.
15.
Use the Type knob to select Spill and use the
Value knob to remove any color cast onto the
foreground. Use the Spill Range slider to remove
any color cast onto the foreground.
• Increasing the range value causes more of the
foreground colors to be corrected for background
color spill.
• Decreasing the range value causes fewer of the
foreground colors to be corrected for background
color spill.
16.
Press NEXT.
17.
Use the Mask knob to apply a mask to the key.
Click Mask to apply a mask to the key.
Chroma Key Advanced Mode
An UltraChrome chroma key, in advanced mode, breaks
the image into ve elements which determine, or partially
determine, which part of the image is keyed out, or
removed.
• Background — Background elements are those
pixels in the source video that are the same color as
the one you chose to key out. Note that the Shadow
and translucent areas (see below) are completely
contained within the Background area.
• Shadow — Shadow elements are those pixels in the
source video with colors that are within the
Background range, but with lower luminance values,
depending on the shadow range. You modify the
Shadow range to cover darker areas of the background
(e.g. where the foreground is casting a shadow on the
background screen).
• Translucency — Translucent elements are those
pixels in the source video that are in the Background
range, but with higher luminance values than the
Shadow range. You can control the upper-end of the
Translucency range by setting a wider hue-range to
constrain the area. You can also control the
transparency of the Translucent area.
• Transition — Transition elements are those pixels
in the source video with colors that are not within
any of the previous three ranges and are also not
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.
• 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 reections 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 an Chroma
Key on. Click Navigation Menu > Live Assist
> ME and select the ME and key that you want to
set up.
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. Click Key Fill and select the
video signal you want to use for the key.
3.
Press CHR KEY. Click Chroma Key.
Tip: Press and hold SHOW ALPHA (C1M, C2M, C2S,
C2X, and C3X only) to have the preview output of the
current ME switch to the alpha signal that is being used by
the selected keyer. Double press the SHOW ALPHA button
to lock show alpha on and press it again to release it. Show
alpha is not available for MiniME
™
outputs.
4.
Use the Mode knob to select Adv. Click
Advanced.
5.
Use the Color knob to select the color you want to
key out. Click the Color button for the color you
want to key out.
6.
Press the Init knob to initialize the chroma key. Click
Init 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.
Carbonite Operation Manual (v13.0) — Keying • 39
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