About Printing for custom items
We are using CMYK (cyan, magenta, yellow, and black) for custom printing on mouse pads, playmats, counter mats and others custom items. When you send an image or photo as RGB mode, our designer will convert it to CMYK mode.
CMYK printing is the standard in the industry. The reason printing uses CMYK comes down to an explanation of the colors themselves. CMY will cover most lighter color ranges quite easily, compared to using RGB. However, CMY by itself can’t create very deep dark colors like “true black,” so black (designated “K” for “key color”) is added. This gives CMY a much wider range of colors compared to just RGB.
The use of CMYK (cyan, magenta, yellow, and black) for printing has become kind of a trope for printers. But the reason why printing uses CMYK isn’t that well known, even to many graphic designers.