Short for Cyan-Magenta-Yellow-Black. CMYK is a color model in which all colors are described as a mixture of four process colors. CMYK is a subtractive color model and used in offset printing for full-color documents. Because such printing uses inks of four basic colors, it is often called four-color printing.
Color printing typically uses ink of four colors: cyan, magenta, yellow and key (black). When CMY “primaries” are combined at full strength; the resulting “secondary” mixtures are red, green and blue. Mixing all three gives black.
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