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Chapter 6 Advanced Operations
106 Advanced Key Operations
4H Mode: Set the maximum width to 4 (4 lines). Key
fill and key source drop down by 4 lines.
8H Mode: Set the maximum width to 8 (8 lines). Key
fill and key source drop down by 8 lines.
Adjusting Chroma Keys
Proceed as follows to make fine adjustments to the chroma
key image obtained with auto chroma key (see page 81).
To select the chroma key composition
method
1
From the top menu, select Key >M/E Key1 >Chroma
Key.
The Chroma Key menu appears.
2
Press [Mix Mode].
A popup window appears.
3
Select one of the following.
Normal Mix: The background is cut out with the key
signal, and then combined with the foreground,
which has also been cut out with the key signal.
Additive Mix: The background, which has been cut
out with the key signal, is combined with the
unshaped foreground. This is effective for a
natural looking composite when the scene
includes glass or other translucent objects.
To turn the plane function on
In an additive mix, the foreground is not shaped by the key
signal, and variations in the (blue) background appear in
the composite image. To prevent this, it is possible to set a
particular luminance level for the background, and
forcibly cut any parts below this level. This is called the
plane function.
The plane function is enabled when additive mix is
selected.
1
In the Key >M/E Key1 >Chroma Key menu, press
[Plane], turning it on.
2
Set the following parameter with knob 1.
To adjust chroma keys manually
Methods of adjusting the composite obtained from chroma
keying include automatic adjustment with the auto chroma
key function, and manual adjustment carrying out the
necessary processing separately. The optimum results will
be obtained by first carrying out adjustments with the auto
chroma key function, then making fine adjustments as
required.
The following manual adjustments are possible.
• Key active
• Color cancel
•Window
•Y balance
• Chroma key shadow
• Video signal adjustment
To make adjustments with key active
When the key active function is on, the composite video is
output and you can adjust the composition method
manually while viewing the monitor.
When the key active function is off, only the foreground is
output. You should turn key active off when making
manual adjustments with color cancel (see the next
section).
1
In the Key >M/E Key1 >Chroma Key menu, turn [Key
Active] on.
2
Set the following parameters with the knobs.
a) Set to 1 for through processing, with no filter applied. The filter
becomes stronger as larger numbers are specified
Knob Description Setting values
1 (Lum) Luminance level 0.00 to 100.00
Knob Description Setting values
1 (Clip) Chroma key
reference level
0.00 to 100.00
2 (Gain) Key gain –100.00 to +100.00
3 (Hue) Hue 359.99 to 0.00
4 (Density) Key density 0.00 to 100.00
5 (Filter) Filter coefficient
1 to 9
a)