Comparing colors, color contrast, mainly refers to the contrast between cold and warm colors. Television images can be divided into two categories based on color tone: cold and warm. Red, orange, and yellow are warm tones, cyan, blue, and purple are cold tones, and green is a middle tone, neither cold nor warm. The rule of color contrast is: in a warm-toned environment, the main body of the cold-toned color is eye-catching, and in a cold-toned environment, the main body of the warm-toned color is the most prominent. In addition to the cold-warm contrast, color contrast also includes hue contrast, brightness contrast, saturation contrast, etc.