Generally, the photo machine of printed light box is 4 colors, 6 colors, 8 colors and other ink colors, which is what we call CMYK printed light box. However, the printed color difference is relatively large, and the printing accuracy is not as high as that of CMYK mode. So when printing, we usually switch to CMYK to print the light boxes of our advertising company. Generally, it is required to switch to CMYK and then print it on the computer, and convert RGB pictures into C. After MYK, you can print it by adjusting the color and brightness. There is basically no problem. Tianyi variable screen light box.