Chapter 4 Keys
223
Key Setting Operations Using Menus
parameter, and the “Crop” parameter, which determines the degree of
truncation (see the following figure).
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.
Reference color
specified by Hue
setting
Range of colors creating the key signal
(to be replaced by background signal)
Range of colors remaining
as foreground
a) The Crop and Angle values do not change even if
you use the auto chroma key function.
Angle
a)
Crop
a)
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