GRASS VALLEY INDIGO, User Manual

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INDIGO AV Mixer User Manual 167
Glossary
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.
L
Limiter
A function which prevents audio levels from
exceeding a specified threshold. Used to sup-
press peaks in audio with large differences in
amplitude.
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.
Low Cut
A high pass filter that removes low frequen-
cies from an audio signal. Useful for speakers
to remove low-level noise and to make
speech clearer.
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.
M
Mask
See Key Mask .
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.
M/E
Abbreviation of mix/effects, pertaining to
the circuitry and controls involved in com-
positing video signals.
Mix
A transition between two video signals in
which one signal is faded down as the other
is faded up.