How to distinguish the image characteristics of cold and warm tones?

It is generally believed that red, orange and yellow are warm colors, while blue, green and purple are cool colors, but this is not accurate. In the color system, colors are divided into cool colors and warm colors, so how to divide them? As we all know, solar energy brings warmth to people. Over time, people will feel warm when they see red, orange and yellow. Sea water and moonlight make people feel refreshing, so seeing cyan or turquoise colors will make people feel cool. It can be seen that the temperature of color is only a habitual reaction of people and the result of long-term practice. People can't judge the warmth and coldness of colors in isolation. At least two colors should be compared together. In fact, the difference between cold and warm colors is produced in contrast, which is a subjective feeling. According to the image characteristics of color, judge the warmth and coldness of color. Cold and warm is color, which is the feeling of psychological factors to color.