Information about Component video
Component video is a video signal that is broken down into separate channels. This is opposed to a composite video signal which has been encoded into one signal. NTSC and PAL video signals are composite video signals. Most component video signals are a variation of the red, green and blue signals that make up a television image. A component signal can be the three discrete R, G & B signals sent down three cables or R-Y, B-Y and Y, delivered the same way. Y is the green channel and carries the luminance information. Therefore, R-Y is the red component minus the luminance information and B-Y is the blue component minus the luminance information. See YUV and YIQ for more information on this color space. Component digital video signals are sometimes referred to as 4:2:2, meaning that in an 8-bit environment, 4 bits are dedicated to the Y component while 2 bits each are dedicated to the B & R components. The luminance or Y channel carries most of the image detail and is, therefore, assigned more bits. S-Video is also considered a component signal, dividing the luminance and chromanance or color channels into two components.
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