Ross Carbonite Black Series, Руководство по эксплуатации, Страница: 60 / 64

signal receives the gamma correction. For example, if
you increase the red gamma correction to the part of
the video signal that has no red component you will
add red to those areas while having little effect on
areas that already contain a significant amount of red.
This allows you to add a red tint to the image while
minimizing the amount of red-clipping that occurs.
General Purpose Interface
A simple high/low signal that is used to trigger an
action either on an external device or on the switcher.
A GPI can be an input or an output to the switcher.
High Definition
A high definition (720p, 1080i, or 1080p/3G) video
signal.
Hue
The characteristic of a color signal that determines
whether the color is red, yellow, green, blue, purple,
etc. (the three characteristics of a TV color signal are
chrominance, luminance, and hue). White, black, and
gray are not considered hues.
Hue Rotation
Hue rotate affects the color of the entire video signal
by rotating the input video hues. This produces an
output video signal with colors that are shifted from
their original hues. By rotating colors around the
wheel, hue values will shift. For example, a clockwise
rotation where yellows become orange, reds become
magenta, blues become green. The more rotation
applied, the further around the wheel colors are shifted.
Key
An effect produced by cutting a hole in the background
video, then filling the hole with video or matte from
another source. Key source video cuts the hole, key fill
video fills the hole. The video signal used for cut and
fill can come from the same, or separate, sources.
Key Alpha
The video signal which cuts a hole in the background
video to make a key effect possible. Also called Key
Video or Source. In practice, this signal controls when
a video mixer circuit will switch from background to
key fill video.
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 shape 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 green, orange, or yellow 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.
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.
60 • Glossary — Carbonite Black Operation Manual (v14.0)