Key clip
In luminance keys, to specify a reference luminance level. The part of the signal above the reference level is used as the key source signal. See also “key source”.
Key fill
A signal used to fill the hole cut with the key source signal.
Key frame
User program effect data which defines the effect at a specific point. User program effects are made up of sequentially executed key frames.
Key gain
The sensitivity of circuits, which can be adjusted with the switcher’s key gain control. This is done to obtain the desired blurring of key edges.
Key invert
In luminance key, to reverse the polarity of a key source signal so that the hole is cut with the darker part of the signal.
Key mask
To hide part of a title key or downstream key signal so that only the desired part is used.
Key source
A signal used to cut a hole in a background picture for insertion of a key fill signal.
Luminance key
Key effect in which a luminance signal is used to define the outlines of characters or graphics.
Luminance signal
The part of a video signal that carries brightness information. Also called the Y signal.
Mix
Effect in which one signal fades in while another fades out. Also called dissolve.
A/B roll editing using the output (playback) of the recorder VTR and a player VTR.
Preroll
Running a videotape a certain distance before the edit IN point in order to bring the tape to a steady speed and synchronize it with other tapes.
Postroll
Running a videotape a certain distance past the edit OUT point in order to monitor the video that follows.
A color difference signal. The red signal minus the Y signal.
RGB signal
A signal format in which red, green, and blue signals are transmitted separately. A separate sync signal may be sent, or the sync signal can be added to the green signal. The
Saturation
The extent to which a color has been diluted by white. Pure red is fully saturated, while pink is diluted.
SDI
A serial component digital signal.
A video signal with separate luminance (Y) and chrominance
(C)components. As opposed to composite video,
Snapshot
Data containing the settings of specific controls on the control panel. Snapshots can be saved and recalled to restore the control panel
to a desired state. | Appendixes |
| |
Subcarrier (SC) |
|
The part of a video signal that |
|
carries color information. The |
|
amplitude represents saturation, |
|
and the relative phase against the |
|
color burst signal represents hue. |
|
Also called the color subcarrier. |
|
Title key |
|
Effect used to superimpose |
|
foreground characters or graphics |
|
on a background. Requires a key |
|
source signal to define the outlines |
|
of the characters or graphics, and a |
|
key fill signal to fill the outlines. |
|
See also “downstream key”. |
|
Transition |
|
A period during which one picture |
|
is replaced by another, or a period |
|
during which a key is inserted or |
|
deleted. |
|
Wipe |
|
A transition effect in which one |
|
picture moves in to replace |
|
another. Often the new picture |
|
appears as a geometrical shape |
|
such as a circle or star. |
|
YUV signal |
|
An analog component signal, |
|
consisting of a luminance (Y) |
|
signal, a color difference signal U |
|
| |
V |
|
Appendixes