combined key type hiding or concealing the result of
adjustments.
6.
Press
Detail Key
and adjust the
Detail Key
Parameters
as follows:
Tip:
The Detail key type is layered over the Wedge key type
and has the largest contribution to the final key-edge
quality.
•
Clip
— use this setting to clip between
the foreground and background. You are
looking to achieve complete background
removal.
Tip:
Clip should be set to the point where the
background is just removed. Setting it too high will
reduce edge quality.
•
Gain
— use this setting to lift the fill
image. You are looking to achieve solid
fill content.
Tip:
Setting the gain too high may introduce dark
boundaries.
•
Shadow Sensitivity
— use this setting to
adjust the level of dark image areas,
particularly in cast shadow areas.
•
Shadow Density
— use this setting to
adjust the apparent lightness of the dark
/ shadow areas in conjunction with the
Shadow Sensitivity
.
•
Highlight Sensitivity
— use this setting
to fill areas with specular highlights, such
as reflective surfaces, that can show
through to the background.
7.
Press
Wedge Key
and adjust the
Wedge Key
Parameters
as follows:
•
Gain
— use this setting to set the
Angle
Control
to
100
and the
Lift
to
0
and then
adjust this setting until the background
is fully removed, leaving a reasonable
edge to the key. Too much gain will
produce hard and undesirable edges.
Tip:
Adjust the Gain with the Bkgd Luma Suppress to
balance between background removal and edge quality.
•
Bkgd Luma Suppress
— use this setting
to compensate for uneven color or
lighting in the shot to ensure the chroma
background is fully suppressed.
Tip:
Turn on a box mask in the keyer you are using to
view the chroma key output to compare the
backgrounds. The masked area shows the background
source without the key settings applied.
•
Angle
— use this setting to change the
color wedge angle (wedge shape) that is
used to detect areas of foreground (fill)
and background (alpha) based on the
chosen color vector. This can help fill in
areas of heavy spill without hardening
edge detail.
•
Lift
— use this setting to amplify the
generated alpha signal to fill in areas of
transparency.
•
Highlight Correction
— use this setting
to lift areas of the image might contain
high luminance levels at edge
boundaries. This could be due to lighting
conditions, camera setup, or subject.
8.
Adjust the
Global Parameters
as follows:
•
Spill Suppression
— use this setting to
select the fill color that has been detected
as color spill. You should not have to
adjust this setting.
•
Edge Luma
— use this setting to offset
the detected level of the chroma
background and allow for fine tuning.
Tip:
Press Auto Edge Luma to have the switcher
automatically adjust the edge luminance based on the
Measurement Src selection.
Tip:
If the subject image contains fine detail such as
fine hair with a luminance level that is close in value to
the chroma set color background level – it may be
difficult to provide good separation between
background and foreground elements.
•
Edge Softness
— use this setting to filter
the edges to eliminate undesirable hard
edges and add realism to a scene by
simulating depth of field characteristics.
•
Re-Spill
— use the
Re-Spill Color
and
Re-Spill Sat
settings to select a color that
is near the average color of the
background/lighting that needs to be
added into those areas of the fill that
contain the spill from the chroma set.
Tip:
Press Auto Re-Spill Color to have the switcher
automatically adjust the re-spill colors based on the
Measurement Src selection.
9.
Use the automatic adjustments as follows:
Tip:
The Auto Adjust allows you to have the chroma keyer
continuously measure the replacement background, the
background you are keying the subject onto, used in the
final composite.
• Use the
Measurement Source
knob to
select the video source that you want to
Ultrix Acuity Operation Manual (v10.1) — Keying • 43
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