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Key Adjustments (Menu)
You can make the following adjustments using a menu
operation.
• Chroma key adjustments (see page 106)
• Key edge modifications (see page 108)
• Masks (see page 111)
• DME effects for keys (see page 113)
• Specifying the key output destination (see page 114)
• Blink (see page 115)
• Video process (see page 115)
• Key modify clear (see page 115)
This section describes adjustment of key 1 on the M/E-1
bank as an example.
Chroma Key Adjustments
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 any fine adjustments as
required.
The following manual adjustments are possible.
Key active
When disabled, only the foreground is output and you can
make color cancel adjustments.
Color cancel
If the foreground image includes shades of the background
color, this function removes the color from the foreground
image.
Window
You can adjust the range over which the key signal is
determined as matching the specified hue. When disabled,
the default range is used for image adjustment.
Chroma keying generates a key signal based on a
particular color (reference color) in the foreground
(typically a blue background), and the "window" refers to
the range of colors which are regarded as matching this
specified reference color to create the key signal.
The region that makes up the key signal in the foreground
(to be replaced by the background) appears as a fan shape
with a cropped tip when viewed on a vectorscope. This
region is specified by two parameters: an "Angle"
parameter and a "Crop" parameter, which determines the
degree of cropping.
a)
Crop
Region remaining as the
foreground
a) The Angle and Crop values do not change even if you use
the auto chroma key function.
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. For example, this can therefore
be used to provide an impression of smoke.
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 allows a shadow falling on the (typically
blue) background color to be rendered more realistically.
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.
Adjusting auto chroma keys
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.
1
In the M/E-1 >Key1 >Type menu (1111), press
[Chroma] in the <Key Type> group.
106
a)
Angle
Hue value of
reference
color
Region creating the key signal
(replaced by the background)
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