Sony MVS-8000X SystemMVS-7000X System User Manual page 132

a)
Crop
Range of colors remaining
as foreground
a) The Crop and Angle values do not change even if you use the
auto chroma key function.
Window adjustment
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.
When the Y balance function is applied to the color cancel
key, the relevant part is output in its original color without
canceling, and therefore it is possible to combine colors
which are the same color as the background (i.e. typically
blue) in the foreground.
Chroma key shadow
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.
Video signal adjustment
You can vary the foreground signal gain, or change the
hue. There are separate adjustments for the gain of the
overall video signal, and Y and C components.
Making auto chroma key adjustments
Auto chroma key is an automatic adjustment function
which allows you to specify a part of the foreground video
(for example, the blue background color) and use it as a
reference for creating the chroma key image.
132
Key Adjustments (Menus)
a)
Angle
Reference color
specified by Hue
setting
Range of colors creating the key
signal (to be replaced by
background signal)
1
In the M/E-1 >Key1 menu, select HF1 'Type,' then
select [Chroma] in the <Key Type> group.
2
Select [Chroma Adjust].
The Chroma Adjust menu appears.
3
Select [Sample Mark] in the <Auto> group.
The foreground video only appears on the monitor,
with a white box-shaped sample selector.
4
Adjust the position and size of the sample selector, to
specify the color to be used as the basis of chroma
keying (typically a blue background).
Knob Parameter Adjustment
1 Position H Horizontal
position
2 Position V Vertical position
3 Size Size
a) The setting ranges depend on the signal format, screen aspect ratio,
and size settings.
5
Select [Auto Start] in the <Auto> group.
This executes an auto chroma key based on the color
specified by the sample selector, and displays the
composite image on the monitor.
Making key active adjustments
When the key active function is on, the composite image is
output to the monitor, and you can watch the monitor while
manually adjusting the keying.
When the key active function is off, only the foreground
image appears. Set this off when manually adjusting color
cancel (see the next section).
1
In the Chroma Adjust menu, set [Key Active] on.
2
Adjust the following parameters.
Knob Parameter Adjustment
1 Clip
Chroma key
reference level
2 Gain Key gain
3 Hue Hue
4 Density Density
5 Filter Filter coefficient
Setting values
–100.00 to
a)
+100.00
–100.00 to
a)
+100.00
1.00 to 100.00
Setting values
0.00 to 100.00
–100.00 to
+100.00
359.99 to 0.00
0.00 to 100.00
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