Colours, which refers to a variety of colors other than achromatic, each having a different hue, brightness, and saturation. Color can be divided into two categories: achromatic and chromatic. The former is black, white, and gray, and the latter is red, yellow, and blue. Colored is the presence or absence of some or some hue in the spectrum, collectively known as color tone. In contrast, there is no color tone in achromatic colors. Achromatic is bright and dark, and it is expressed in white and black, also called color. Color rendering is complex, but can be determined using three sets of extra-micro values. One is the color tone, which is the hue; the second is the light and dark, that is, the brightness; the third is the color, which is the purity and chroma. Brightness and chroma determine the state of color. It is called the three attributes of color. The brightness and hue are combined into a two-line color state called a hue. Color is a completely subjective cognitive experience, just like taste and smell.
The initial basic hue is: red, orange, yellow, green, blue, purple. Insert one or two intermediate colors in the middle of each color, the color of the head and tail, in the spectral order: red, orange red, yellow orange, yellow, yellow green, green, green blue, blue green, blue, blue purple, purple. Adding an intermediate color to red, purple, and purple can produce twelve basic hue.
A color tone, there are also strong and weak points. In the case of Zhenghong, there are bright reds with no impurities, and there are smashing and dry-like "roses", but also a lighter pink. Their hue is the same, but the strength is different, generally called (Sa + ura + lOn) or chromaticity. Chroma is often used to describe the high and low, the higher the chroma, the more pure and bright the color; the lower the chroma, the more the color is, the more turbid. Solid color is the highest level of chroma.
Color can be divided into two categories: achromatic and color. The color is a general term for achromatic and colored. Achromatic refers to white, black and different shades of gray. White, gray, and black objects are not selective for reflection at each wavelength of the spectrum, they are neutral colors. Colored objects are selective for reflection at various wavelengths of the spectrum so they appear colored under white light.