Chapter 4 Keys
218
Key Setting Operations Using Menus
To invert the black and white sense of the key source: Press [Key
Invert], turning it on.
To adjust the horizontal position or key source width for a luminance
key, linear key, or chroma key: Press [Key Position], turning it on,
and set the parameters.
To set the key priority: Press [Key Priority] or select VF7 ‘Misc’ and
HF3 ‘Key Priority’ to access the Key Priority menu.
For details, see “Setting the Key Priority by a Menu Operation” (page
164).
Chroma Key Composition
In creating a chroma key image, either a normal mix or an additive mix can be
used. To select which, use the Type >Chroma Adjust menu for the keyer.
Normal mix: The foreground is cut out with the key signal, and then combined
with the background, 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.
Plane function
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
any parts below this level are cut forcibly.
Composing an image by chroma keying
There are two types of composition for chroma keying: normal mix, and
additive mix.
1
In the M/E-1 >Key1 menu, select HF1 ‘Type.’
2
Select [Chroma] in the <Key Type> group.
It becomes possible to adjust the key density (see page 217).
Knob Parameter Adjustment Setting values
1 H Phase Key horizontal position –4.00 to +4.00
2 Left Key left edge position –4.00 to +4.00
3 Right Key right edge position –4.00 to +4.00
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