Isaac Newton’s theory of light indicates that all colors can be generated from three basic colors: red, green, and blue. RGB (Red, Green, Blue), a light-color structure that contains 3×256 values of letter symbols, and CMYK (Cyan, Magenta, Yellow, Key black), a pigment-color structure that contains 4×100 values of letter symbols, are the two most used color frames. Other color frames such as HSV (Hue, Saturation, Value) are derived from RGB and CMYK.
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Source: Phys.org