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Chapter 6 Advanced Operations
108 Advanced Key Operations
To adjust the window, the Clip, Gain, Hue must be
adjusted to appropriate values. Set these to appropriate
values first, and then proceed as follows.
1
In the Key >M/E Key1 >Chroma Key menu, press
[Window], turning it on.
2
Set the following parameters with the knobs.
a) See above figure.
To adjust the Y balance
In normal chroma keying, the key signal is based on the
chrominance component only, and all elements of the
foreground with the same hue are replaced by the
background. Using the Y balance function, you can specify
a luminance level range within which the key is active, and
replace the specified part by the background.
You can use the Y balance function independently on the
key signal for the composition and the key signal for the
color cancel function. When applied to the key signal for
the composition, this produces the foreground with the
color cancel effect applied. This can therefore be used to
provide an impression of smoke, for example.
1
In the Key >M/E Key1 >Chroma Key menu, press [Y
Balance], turning it on.
2
Set the following parameters with the knobs.
To adjust chroma key shadows
This function provides a more realistic treatment when the
shadow of an object in the field of view falls on the blue
background. Since parts of the blue background darker
than a specified intensity are treated as shadows, there is
no effect on cutting out of the foreground.
1
In the Key >M/E Key1 >Chroma Key menu, press
[Shadow], turning it on.
2
Set the following parameters with the knobs.
Note
When chroma key shadowing is on, key edges are normal
with soft edges off.
To adjust video signals
You can vary the gain and hue of chroma key foreground
video. Gain can be adjusted for the overall video signal, or
individually for Y and C.
1
In the Key >M/E Key1 >Chroma Key menu, press
[Frgd V Proc], turning it on.
2
Adjust the following parameters with the knobs.
Knob Description Setting values
1 (Crop)
Crop value
a)
100.00 to 0.00
2 (Angle)
Angle value
a)
180.00 to 0.00
Knob Description Setting values
1 (Clip) Reference level of
color cancel key
0.00 to 100.00
Crop
a)
Angle
a)
Reference color hue
Range of colors
remaining as
foreground
Range of colors creating the
key signal (to be replaced by
background signal)
a) The Crop and Angle values do not change even if you
use the auto chroma key function.
2 (Gain) Key gain –100.00 to +100.00
3 (Lum) Luminance 0.00 to 100.00
Knob Description Setting values
1 (Lum) Reference
luminance of
shadow
0.00 to 100.00
2 (Gain) Gain of shadow
key
–100.00 to +100.00
3 (Density) Density of shadow 0.00 to 100.00
4 (Soft) Softness of
shadow
0.00 to 100.00
Knob Description Setting values
1 (Video Gain) Overall gain of
video signal
–100.00 to +100.00
2 (Y Gain) Gain of Y signal –100.00 to +100.00
3 (C Gain) Gain of C signal –100.00 to +100.00
4 (Hue Offset) Amount of hue
offset
–180.00 to +180.00
Knob Description Setting values