Key Invert
An effect that reverses the polarity of the key source so
that the holes in the background are cut by dark areas of
the key source instead of bright areas.
Key Mask
A keying technique in which a pattern is combined with
the key source to block out unwanted portions of the key
source.
Key Video
A video input which is timed to fill the hole provided by
the key source video. An example of key video is the
video output of a character generator.
Linear Key
Linear keys make it possible to fully specify the
transparency of a key from opaque, through transparent,
to fully off. The transparency is specified by the key
alpha that is associated with the key video. A keyer
capable of a linear key converts the key signal voltage
directly to the transparency effect on the screen.
Mnemonics
A multicolored display used to show the names of a
source above or below the source button or used as a
custom command or pattern button.
Offsets
Offsets shift the video signal by a set amount. Depending
on the offset applied, different parts or all of the video
signal may be affected. Clipping occurs if applied offsets
cause output signal values to fall outside the allowable
range.
Pre-Delay
A pre-delay is a delay that is inserted into a transition
between the triggering of a GPI output and performing
the transition. The length of the pre-delay is usually the
length of time your video server requires to start playing
a clip or your character generator required to load a page.
Progressive
A Progressive scan video format draws each scan line in
sequence, starting from the top of the screen and working
to the bottom. Unlike Interlaced, with Progressive scan
the entire image is drawn at one time, in a single pass.
This means that there are no fields in a Progressive scan
image.
RossTalk
An ethernet based protocol that allows the control over
Ross devices using plain english commands.
Standard-Definition
A standard definition (480i or 576i) video signal.
Self Key
A key effect in which the same video signal serves as
both the key signal and key fill.
Shaped Key
An additive key where the Key Alpha cuts a hole based
on the monochrome value of the alpha. Shades of gray
are translated into either white or black, giving the key
a hard edge. Shaped Key alphas are sometimes used with
Character Generators to cut very precise holes for the
fill.
Split Key
A Split key allows you to assign a different alpha source
for a key than the fill/alpha associations that are set up
during configuration or to use a separate alpha source
for a Self key.
SuperBlack
In broadcast video, the legal color range is 7.5 IRE
(black) to 100 IRE (white). However, if a graphic is
coming from a computer, the legal color range on a
computer is 0 IRE to 109 IRE. The color range from 0
to 7.5 IRE is called SuperBlack and the color range from
100 to 109 IRE is called SuperWhite.
Tally
An indicator which illuminates when the associated
button, or control, is selected or is on-air.
Unshaped Key
A multiplicative key where the Key Alpha cuts a hole
based on the gradient values of the alpha. Shades of gray
are translated into transparency levels, giving the key a
soft edge. Unshaped Key alphas can also be considered
true linear alphas. Key alphas are set to unshaped by
default.
Acuity Setup Manual (v9.2) — Glossary •
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Summary of Contents for Acuity 4410AR-020
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