Three primary colors

Also known as three primary colors; They are red, yellow and blue.

The color difference

Light because wavelength is different, refractive index is different, cause tonal deviation thereby, call chromatic aberration. Also refers to the difference between a known color and a color standard.

Color chart

Based on red, yellow and blue, the intermediate color is obtained by mixing two primary colors. In order to achieve the desired effect, dyes are added according to the toning diagram to adjust the color, so as to avoid how deep or too shallow, called toning.