Luminance Information
The monochrome luminance (Y) signal is derived from gamma-corrected red, green, and blue (R′G′B′) signals:
Technology Trade-offs
Due to the sound subcarrier at 4.5 MHz, a requirement was made that the color signal fit within the same bandwidth as the monochrome video signal (0–4.2 MHz). For economic reasons, another requirement was made that monochrome receivers must be able to display the black and white portion of a color broadcast and that color receivers must be able to display a monochrome broadcast.
Color Information
Insider Info
The eye is most sensitive to spatial and temporal variations in luminance; therefore, ...
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