Color, like sound, is based on frequencies. Each color has its own specific frequency in the visible spectrum and its own specific wavelength. Each color is defined scientifically by its frequency or its wavelength. Wavelength is related to frequency in that the higher the frequency, the shorter the physical length of the wave. Color frequencies are extremely high in the spectrum, and therefore are easier to notate by wavelength, rather than frequency (cycles per second or hertz). Wavelengths of light are measured in nanometers, or billionths of a meter.
Additive and Subtractive
There are two ways that color is perceived. First, by adding the frequencies of light together, which is referred to as additive. Any light-emitting ...