Chapter 6 Keys; Overview; Key Fill And Key Source; Key Type - Sony XVS-G1 User Manual

Keys

Overview

A key is a function in which a part of the background
image is replaced by inserting an image or superimposed
text.
The signal used to cut out a portion of the background
image (key source), signal to embed in the cutout portion
(key fill), and key source processing method (key type) can
be selected for a key.
The number of keys that can be used on each switcher bank
is four when the system signal format is 2160P, and eight
when the system signal format is 1080P or 1080i.
Note
When M/E split is enabled, the number of keys that can be
used will vary depending on the settings.
For details, see "Setting Sub Block keys" (page 306).

Key Fill and Key Source

The key fill signal can be set to a key bus signal or color
matte.
The key source signal can be selected using the following
three modes.
Self mode: Use the same signal as the key fill signal.
Auto Select mode: Use the signal assigned as a pair with
the key fill bus signal on the cross-points.
Split mode: Select and use a different signal than the key
fill bus pair signal.
Chapter

Key Type

The key type sets the manner in which the key source is
used to cut out the background.
You can select the following key types.
Key type Description
Luminance key The background is cut out according to
the luminance signal of the key source,
and at the same time the key fill is also
cut out by the key source and then added
to the background.
Linear key This is a type of luminance key, with a
reduced variability in gain allowing more
precise adjustment.
Chroma key A key signal based on a particular color is
used to cut out the background, and the
key fill is then inserted.
Key wipe pattern A wipe pattern of an independent key
key transition is used to cut out the
background, and the key fill is then
inserted.
Clean mode
In a luminance key or linear key, you can enable clean
mode.
When clean mode is enabled, key fill is added to the
background without cutting out by the key source.
Note
When clean mode is enabled, for the parts of the key fill
that are not black (excluding the part that is inserted), color
is added to the background.
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