Appendix: Video Definitions; Rgb And Video - Crestron UPX-2 Operation Manual

Universal Presentation Processor

Appendix: Video Definitions

Operations Guide – DOC. 6276B
The following definitions may be helpful when setting up the UPX-2.
•
RGB and video definitions, on page 77
•
Video standards, on page 78
•
Progressive and interlaced video, on page 79
•
Aspect ratios, on page 81

RGB and Video

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 UPX-2 can be horizontal and vertical (H&V),
composite sync, or sync on G. Output sync of the UPX-2 is always H&V.
Composite (480i) and S-Video
Compression of all of 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
Crestron UPX-2
B
(the analog color space designation in
B
R
Universal Presentation Processor: UPX-2 ¥ 77
(the digital color space
(the digital color space