Basic Video Processing 19
Key 1
Key 3
Effect of a common transition
In the case shown in the previous illustration, carrying out
a common transition produces the following change in the
image.
Transition
Key 2 Key 4
Changing the background and keys 1 to 4 simultaneously
Selecting the transition type determines the way in which
the transition occurs. The following transition types are
available.
•
Mix
•
NAM (non-additive mix)
•
Super mix
•
Preset color mix (color matte)
•
Wipe
•
DME wipe
•
Clip transition
•
Cut
There are two modes of executing a transition: an auto
transition by button operation or a manual transition using
the fader lever. It is also possible to combine these two
modes.
Transition type: Wipe
Same wipe is applied to
background and key.
Effect of a common transition
Effect with use of an independent key transition
The key is inserted with an independent key transition as
the background changes with a common transition,
providing the following result.
Transition type: Wipe
Independent key transitions
In addition to common transitions, it is possible to carry
out independent transitions on the keyers of the M/E banks
and PGM/PST bank. These are called “independent key
transitions.”
Independent key
transition type: Wipe
Different wipe patterns are
applied to the background
and key transitions.
By carrying out an independent key transition in
combination with a common transition, different transition
types can be used for the background and keys.
The following compares the independent key transition
with a common transition, taking a simultaneous change of
the background and key as an example.
Video used in the transition
Effect of a background transition and independent key transition
For details, see Chapter 3 “Signal Selection and
Transitions”
(
1
p. 59).
Keys
A key is an effect in which a part of the background image
is replaced by an image or superimposed text. The signal
determining how the background is cut out is termed “key
source,” and the signal that replaces the cut-out part is
termed “key fill.” The system component responsible for
processing a key is referred to as a “keyer.”
For the four keyers on each switcher bank, you can use the
following key types (i.e., methods of processing the key
source).
Background A Background B Key to insert
•
Luminance key
•
Linear key
•
Color vector key
•
Chroma key
•
Key wipe pattern key
To Next Page
Loading...
