RGB uses a lot of bandwidth.
Color Difference Component Video
If you are in a studio setting where you can use individual cables for each of the red, green, and blue channels, you don't have to worry very much about how much bandwidth they use. If, however, you have to send a color signal through the air or several video signals through one cable, bandwidth can become a problem. To save bandwidth, engineers developed color difference component video. This system still uses three different signals to carry the complete picture, but the engineers came up with a method that eliminates the redundancy found in the RGB channels. First is the Y channel, which is all of the luminance channel. We learned earlier that the green channel makes up 59% of ...
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