Grass Valley Karrera Video Production Center v.4.0 User Manual
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KARRERA — User Manual
Glossary
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 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.
Learn
To save a panel setup using E-MEM.
Linear Key
A key in which the keyer signal is faithfully
reproduced in the final key effect. Linear
keying preserves soft key edges, and gener-
ally has a gain of 1, or unity.
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 Karrera, only the analog ref-
erence 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.
Mask
See
Matte
Internally-generated color video which can
be adjusted for luminance, hue, and chroma.
Matte can be used to fill areas of keys and
borders.
Matte Fill
Using matte video to fill the hole of a key ef-
fect.
Matte Generator
A video generator that produces matte sig-
nals.
ME
Abbreviation of mix/effects, pertaining to
the circuitry and controls involved in com-
positing video signals.