GRASS VALLEY Kayak HD 100C, User Manual

Page: 542 / 558

542 Kayak — User Manual
Glossary
Positioner
A hardware positioner with control of multi-
ple axes.
Key
An effect where a portion of a background
scene is replaced by a new video. Key cut
and key fill signals are involved, though in
some cases the same signal may be used for
both (self key).
Key Cut
In key effects, the key cut signal is used to
specify where to cut a hole in the background
that will be filled with the key fill video. The
key cut signal determines the shape of the
key effect.
Key Fill
In key effects, the video signal which fills the
hole cut in the background video.
Key Invert
Reversing the polarity of a key, such that ma-
terial formerly keyed out will be keyed in,
and vice versa.
Key Mask
A key mode which allows use of a wipe pat-
tern generator to prevent some undesirable
portions of the key cut signal from cutting
holes in the background video.
Key Memory
A feature where the last keying and video
processing settings for a source are retained
and re-imposed when that source is re-select-
ed. Default source memory values can be set
for each source on each bus.
Key Priority
The stacking order of multiple keys. The
keyed signal with the highest priority ap-
pears in front of all the others. Keyed signals
appear below higher priority keys and in
front of lower priority keys, in a stack. A key
priority transition changes the order of the
keys without changing the background out-
put.
Key Frame
A complete definition of an effect at a single
point in time. Default keyframe values can
be set for a suite. See Snapshot on page 544 .
Linear Key
A Luminance key with a special parameter
Setting: gain 100%, Clip 50%.
Look Ahead Preview
Video that shows the result of the currently
setup next transition.
Looping, Loop-Through
An input that includes two connectors. One
connector accepts the input signal, and the
other connector is used as an output for con-
necting the input signal to another piece of
equipment. On Kayak HD, only the analog
reference input is loop though.
Luminance
The brightness of the picture or area of the
screen being considered. Chroma, hue, and
luminance make up the three characteristics
of television color.
Luminance Key
A key effect in which the portions of the key
cut signal that are greater in luminance than
the clip level cuts the hole in the background
scene. Generally used when the key cut and
key fill signals originate from the same
source. Luminance key clip and gain is ad-
justable.