The CMYK color model is a subtractive color model, based on the CMY color model, used in color printing, and is also used to describe the printing process itself. CMYK (Cyan, Magenta, Yellow, Key/Black) is the color space for printed materials. The CMYK color model is a subtractive color model, based on the CMY color model, used in. CMYK Color Mode This is a four color mode that utilizes the colors cyan, magenta, yellow and black in various amounts to create all of the necessary colors when printing images. What is the difference between the RGB and CMYK color space and why. CMYK is a subtractive color mode, which means you subtract light from a piece of paper (or in.