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A common way that colours are specified for print is by defining the proportions of Cyan, Magenta, Yellow and Key (usually black) that, when combined, make the desired colour.

In CMYK printing, four plates are printed, each with one of the four CMYK colours. Each CMYK value specifies how much ink each plate will have.

Pure yellow, for example, is C: 0, M: 0, Y: 100, K: 0.

Pure red, for example, is C: 0, M: 100, Y: 100, K: 0.