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The green channel is the cleanest channel in most digital cameras today. The green channel has the highest luminance of all three (red, green and blue) digital channels, and thus the sensors deliver the least noise in that channel. The processing is three-fold: There is Bayer Pattern filtering (which occurs in single CMOS/CCD sensors, but not 3-CCD cameras), DSP (digital signal processing) and the processing in the actual recording format.
Bayer Pattern means that the sensor has a filter arrangement on its pixel array that actually records twice as many green pixels as red or blue. So the actual recording resolution of the green channel is double that of the other channels.
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