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	Computer monitors use a cathode ray tube or CRT to generate color.
	The inside of the monitor screen is covered with phosphor dots or stripes, as we saw earlier. Dots are arranged in groups of three, called "triads."
	Three electron guns fire a beam of electrons through a shadow mask to excite the three phosphors in each triad. The glowing of the phosphor dots in the triad is controlled by the beam current. Because the three color phosphors are clustered very close together, they are viewed as one pixel. When a scanned picture is displayed, the color of each pixel is determined by the color values in the scanned image file.

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