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Consumer Electronics by S. P. Bali

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LUMINANCE SIGNAL

The luminance signal can be obtained by adding together the signals representing the three primaries, R, G and B. However, the three voltages contributing the luminance signal must be taken in different amounts because the human eye responds to each of the three primaries differently. Calculations show that the luminance signal associated with whites of the picture should contain 30% red, 59% green and 11% blue.

 

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Fig. 31.4 The optics in a colour camera separate the scene into red, green and blue elements.

 

This equation, ...

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