CMYK 【CMYK color model】
full spelling ： Cyan-Magenta-Yellow-Black
CMYK is short for cyan, magenta, yellow, and black. These are four primary colors used in color printing. Most Color Printers use these as their printer colors.
These are called subtractive colors. The colors cyan, magenta and yellow combine together on white result in color black. Subtracting one or more of these colors will yield any other color. When combined in various percentages, these four inks will create an entire spectrum of colors, including those used in color photographs.