Ross CrossOver 16 Specifications download pdf (Page 58)

Glossary

Auto Key

A pairing of two video signals, a key video and a key

alpha, to create a key. In the switcher, you associate the

ll and alpha so that the switcher knows which alpha to

use when the video is selected.

Auto Transition

An automatic transition in which the manual movement

of the fader handle is simulated electronically. The

transition starts when the AUTO TRANS button is

pressed and takes place over a pre-selected time period,

measured in frames.

Chroma Key

Chroma Key is a key in which the hole is cut based on

a color value, or hue, rather than a luminance value or

alpha signal. The color is removed and replaced with

background video from another source.

Cut

An instantaneous switch from one video signal to another.

Dissolve

A transition from one video signal to another in which

one signal is faded down, while the other is

simultaneously faded up. The terms mix or cross-fade

are often used interchangeably with dissolve.

Dynamic Host Configuration Protocol

An Ethernet protocol where a device, such as the

switcher, is given an IP address by the network host. This

eliminates the need to manually enter the network

parameters and IP address.

Field

One half of a complete picture (or frame) interval

containing all of the odd, or all of the even, lines in

interlaced scanning. One scan of a TV screen is called a

eld; two elds are required to make a complete picture

(which is a frame).

Frame

One complete picture consisting of two elds of

interlaced scanning lines.

File Transfer Protocol

A network protocol that is used to transfer les from one

host computer to another over a TCP-based network.

Gain

Gain represents the range of signal values present in a

video signal from a lowest to a highest point (from black

to white for example). Increasing gain expands this range,

while decreasing gain compresses this range. Clipping

occurs if applied gain changes cause output signal values

to fall outside the allowable range. Generally, increasing

the gain for a specic color component causes the video

signal colors to become increasingly saturated with that

color. Similarly, decreasing the gain for a specic color

component progressively removes that color component

from the output video signal.

Gamma

Gamma corrections introduce non-linear corrections to

a video signal. A gamma correction can be described as

taking a point on the output versus input video signal

line and pulling it perpendicularly away from the line.

The result is a Bezier curve between the start, the new

point, and the end point. Generally, increasing the gamma

value adds more of the component to the video signal in

the location of the gamma offset point. Decreasing the

gamma value reduces the amount of the component in

the video signal in the location of the gamma offset point.

Moving the gamma offset point allows you to select

which part of the input video 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 signicant

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 denition (720p or 1080i) 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 lling the hole with video or matte from

another source. Key source video cuts the hole, key ll

58 • Glossary — Carbonite Operation Manual (v8.0)

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