Why do printed images need to be converted from RGB format to CMYK format?

Generally, most of the image colors we see on electronic screens use RGB mode, also known as "network color". The actual printing industry use CMYK color "printing color". CMYK mode can simulate the basic four-color performance of printing ink, and the printed colors will be more accurate. If printing in RGB mode, the machine will forcibly convert the color of the print file from RGB to CMYK during the printing process, changing the original color value, so that the color of the printed product becomes darker or has obvious color difference. The default setting of most design software on the market is RGB mode, so remember to set the image file to CMYK mode before outputting the file.