Comparison color, color contrast, mainly refers to the color cold and warm contrast. The TV picture can be divided into two categories: cold and warm tones. Red, orange and yellow are warm tones, green, blue and purple are cold tones, and green is the middle tone, neither cold nor warm. The law of color contrast is: in the warm tone environment, the cold tone subject is eye-catching, and in the cold tone environment, the warm tone subject is the most prominent. Color contrast in addition to warm and cold contrast, there are color contrast, brightness contrast, saturation contrast and so on.