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Using Keys to Compose Video
Chapter 4 Basic Operations
2
In the KEYER block, press the CK button.
A CK Manual sub menu appears in the display panel.
3
Adjust the parameters.
Chroma key (CK) parameters (Chroma Key menu)
When viewed on a vectorscope, the part of the foreground
that becomes the key signal (the part that is replaced by the
background) appears as a fan shaped area centered around
the keying color (see the following figure).
You can adjust the shape of this area by adjusting the
Angle parameter. You can also adjust the Y, C, and key
signals individually.
When there are patches of the background color in the
foreground picture, you can remove those patches from the
foreground picture (color cancel function). You can
suppress the Y component of the video, and also use two
parameters (C1 and C2) to adjust the chroma components
(see figures below).
a) Enabled only when Color cancel is set to On.
b) Affects only Y signal of foreground video.
c) Affects only C signals of foreground video.
d) Affects only key signals.
a) The C1 setting is ignored when C2 is anything other than 0.00.
To adjust key opacity
Use the Other sub menu to adjust the opacity of chroma
keys.
The Other sub menu has the following parameter.
SAT: 100%
Hue of keying color
Angle
Area removed
by chroma key
Adjust with C2
Adjust with C1
C1: Small C1: Large
C2: Small C2: Large
Parameter group (1/4)
Knob Parameter Description Settings
F2 Hue Keying color hue 0.0 to 359.5
F3 GN Gain 0.0 to 63.99
F4 Clp Key reference level 0.0 to 100.0
Parameter group (2/4)
Knob Parameter Description Settings
F1 Y Offset value vs.
Angle
a) b)
–45.00 to
45.00
F2 C Offset value vs.
Angle
a) c)
–45.00 to
45.00
F3 K Offset value vs.
Angle
d)
–45.00 to
45.00
F4 Ang Angle of the area
that becomes the
key signal (Angle)
5.00 to 90.00
Parameter group (3/4)
Knob Parameter Description Settings
F1 Col Color cancel On/Off
F2 Y Suppression of Y
component
0.00 to 31.99
F3 C1 Suppression by C1
parameter
a)
0.00 to 31.99
F4 C2 Suppression by C2
parameter
0.0 to 100.0
Parameter group (4/4)
Knob Parameter Description Settings
F1 ShL Positional
adjustment of left
side of key signal
0 to 3
F2 ShR Positional
adjustment of right
side of key signal
0 to 3
Knob Parameter Description Settings
F1 Opac Opacity 0.0 to 100.0
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