Hue is also called hue, and the generation of color is determined by the length of the wavelength of the reflected (refracted) light when the object is irradiated with light. Due to the different qualities and pigments of various objects, the absorption and reflection of color light formed by various objects are different, which constitutes various objects showing colors such as red, orange, yellow, green, cyan, blue, and purple. Colors in turn correspond to the spectrum of color light, that is, the color is determined by the wavelength in the long and short range of the color light. Therefore, the hue of the color exhibited by various objects is determined by the light source of the color light in the length range of the wavelength of the color light in the spectrum, and the length of the wavelength of the color light exhibiting a certain color and reflected by the object is just within the wavelength range of a certain color., and know the color and hue that people can see with respect to the ratio.