They can’t. We just decided that the RGB system of color is the most efficient for technological applications, and the easiest to apply to nearly any modern device. It also corresponds to the biological system we use in our eyes. You can make over 16,000,000 different colors just by mixing red, green, and blue, but there are still in theory an infinite amount of color they can’t reproduce. Remember that color is derived from the visible region of the electromagnetic spectrum. Add a decimal place to your unit, and boom, you have a new color!
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