Video Definitions; Rgb; Composite And S-Video; Y, P B , P R Component Video - Crestron C2N-DVP4DI Reference Manual

Crestron C2N-DVP4DI

Video Definitions

Reference Guide – DOC. 6177A
The following definitions may be helpful when setting up the C2N-DVP4DI.

RGB

The eye is capable of seeing only three colors, red (R), green (G), and blue (B). The
brain extracts full spectrum information from varying intensities and combinations of
these three colors. For example, when you see red and blue together, the brain
interprets a third color. The proportion of red to blue determines if this color is
shifted towards the red (violet) or the blue (purple).
Because of this physiological limit of vision, a video system need only reproduce
red, green, and blue information.
Input synchronization for the C2N-DVP4DI can be horizontal and vertical (H&V),
composite sync, or sync on G. Output sync of the C2N-DVP4DI is always H&V.
Composite (480i) and S-Video
Compression of all the video information (luminance and chrominance) into one
signal was devised in the early days of color television to permit transmission over
the airwaves. This standard was defined by the National Television Standards
Committee (NTSC) and is known as composite video. However, these compressed
composite signals, which require RGB separation to drive a video display, cannot be
fully restored to their original quality.
An S-video cable carries two separate signals, one for luminance (Y) and one for
chrominance or color (C). The Y signal is the same as in the native component video
format. And the C is simply a combination of the B-Y and R-Y color difference
signals. (S-video is also referred to as Y/C.) By keeping luminance and chrominance
information separate, most of the signal loss inherent in the conversion of composite
to RGB video is avoided.
Y, P , P Component Video
B R
The original RGB signal is divided into three component parts:
•
The luminance signal contains the black & white (brightness) information
in the original RGB signal. It is referred to as the "Y" component.
•
The color difference signal B-Y contains the blue information, minus the
luminance information. This signal is also called C
signal designation), and P
component video).
•
The color difference signal R-Y contains the red information minus the
luminance information. This signal is also called C
signal designation), and P
component video).
The color difference channels (B-Y and R-Y) are algebraically recombined with the
luminance channel to produce a full color picture, recreating the green information
through this mathematical process. The original green data can consume more than
half the bandwidth of a video signal.
NOTE: Color space is a method used to specify, create and visualize color. Color is
defined by three attributes: brightness, hue and intensity. These three dimensions of
Digital Video Processor
(the digital color space
b
(the analog color space designation in
b
(the digital color space
r
(the analog color space designation in
r
Digital Video Processor: C2N- DVP4DI • 93