This ensures a monochrome receiver will display a correct picture in black and white, where a given color is reproduced by a shade of gray that correctly reflects how light or dark the original color is.
2.
In a monochrome receiver the luminance signal is amplified to drive the control grid in the electron gun of the CRT . This changes the intensity of the electron beam and therefore the brightness of the spot being scanned.
3.
Early colour television studio cameras consisted of four tubes to relay the picture : three were receptive to colour ( red, green and blue the chrominance signal ) with the fourth providing a high-resolution monochrome image ( the luminance signal ) which was still required as many viewers still watched on monochrome receivers.
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