RGB cables are named so, because the plugs at the ends of the cables are color coded red, green and blue. There are a variety of RGB cables. All RGB cables are a type of component video cables. Component video cables are able to split video signals into three different signals. Two of the three signals control how much red and blue there is in a picture. They are called the B-Y and R-Y components. The third signal, called the luminance signal handles black and white information and controls the brightness of a picture. It is often called the Y component. Unlike composite cables, there is no compression of any signals. Because of this the depth of color and resolution achieved is superior to composite video and is even an improvement of S-Video setups.
RGB is still sometimes used on computers but is increasingly being replaced by digital formats that require digital video interface cables (DVI cables). Some of the many devices that are RGB input devices and use RGB cables and technology are color televisions, digital cameras and scanners. There are also several RGB output devices that are used very often. They include, computer and cell phone displays, television sets with a variety of display types such as cathode ray technology (CRT), liquid crystal display (LCD) and plasma display or LED display, video projectors, and the large screen displays called JumboTron that are used at many sporting facilities and entertainment venues.
HDMI Cable
RGB analog composite video signals must always be combined with some other signal in order to function properly. One of the ways this is done is called composite sync. In any type of display, the resolution is determined by the number of pixels that are arranged both vertically and horizontally on the display device such as a computer monitor or a television monitor. The number of vertical lines in the display is always fixed. The vertical lines are also often referred to as scan lines. However, conversely the number of pixels that are in between each vertical line can vary. The amount of pixels determines the horizontal resolution. Depending on the ability of the monitor or display output, the quality of resolution achieved can vary. In this type of setup, both the horizontal and vertical signals are combined on a completely separate wire. This type of synching is called RGBS. A true composite signal is achieved by utilizing four wires. They are colored red, green, blue and a plug for sync which is normally white or yellow in color. Another way to combine signals is called separate sync. In separate sync, the horizontal and vertical signals are each carried on a separate wire. This type of synch is used in RGBHV setups. Separate sync is common in VGA devices such as analog computer monitors. Separate sync requires five different plugs. They are color coded red, green, blue and either a combination of yellow and white, yellow and black, or gray and black plugs.
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