Color is a subjective visual perception caused by visible light of certain wavelengths in the human eye. Color is determined by the individual perception of the human eye and is subjective to eye sensitivity.
Color is the visual impression of hue, color saturation and brightness. Color theory distinguishes between variegated color and achromatic color, which in itself is a contradiction. While variegated color is characterized by its chromaticity, color intensity and color depth, achromatic colors are characterized by gray levels between black and white. The gray palette ranges from achromatic-dark-unsaturated (black) to achromatic-light-unsaturated (white). Colors perceived by the human eye are in the wavelength range between 360 nm and 760 nm.
The human eye can perceive about 400,000 different colors. This number results from the perceptible number of color tones, about 130, of color saturations, also about 130, and from the perceptible brightness values, between 15 and 25.
In color theory, a distinction is made between primary colors and secondary colors, the former forming the basic or primary colors, the latter the mixed colors resulting from the color mixing of two or more primary colors.