Operations Advanced 6 Chapter
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.
Knob | Description | Setting values |
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1 (Lum) | Luminance level | 0.00 to 100.00 |
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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.
Knob | Description | Setting values | |
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1 | (Clip) | Chroma key | 0.00 to 100.00 |
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| reference level |
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2 | (Gain) | Key gain | |
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3 | (Hue) | Hue | 359.99 to 0.00 |
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4 | (Density) | Key density | 0.00 to 100.00 |
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5 | (Filter) | Filter coefficient | 1 to 9 a) |
a)Set to 1 for through processing, with no filter applied. The filter becomes stronger as larger numbers are specified
106 Advanced Key Operations