Chapter 4 Keys
157
Overview
Clean mode
In a luminance key, linear key or color vector key, you can enable the clean
mode. When the clean mode is on, the key source does not affect the key fill,
which is added unchanged to the background. This improves the keyed image
quality, but means that the part of the key fill signal which is not to be inserted
must be completely black, or it will color the background. You set the clean
mode with the Type menu of the respective keyer. (See “Setting the key type in
a menu” (page 164).)
Note that in the following situations, the clean mode goes off, and cannot be
turned on.
• When the key type is a pattern key
• When key inversion is on
• When the key fill is a matte
• When the key edge is an outline
• When the key edge is normal with soft edge being on
• When fine key is on
• When the key positioner is on
Chroma key
A key signal based on a particular color is used to cut out the background, and
the key fill is then inserted. The inserted signal is also referred to as the
foreground, and the composite image is called a chroma key image.
For details of chroma key composition, see “Chroma Key Composition” (page
166). For details of video adjustment operations and the adjustment items, see
“Chroma Key Adjustments” (page 168).
Foreground
Background
Chroma key image
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