The CMYK model is based on the light-absorbing
quality of ink printed on paper. As white light strikes translucent
inks, certain visible wavelengths are absorbed (subtracted), while
others are reflected back to your eyes. For this reason, these colors
are called subtractive colors.
In
theory, pure cyan (C), magenta (M), and yellow (Y) pigments should
combine to absorb all light and produce black. Because all printing
inks contain some impurities, however, these three inks actually
produce a muddy brown. For this reason, black ink (K) is used in
addition to the cyan, magenta, and yellow inks in four-color printing.
(K is used for black instead of B to avoid confusion with blue.)
Subtractive colors (the CMYK model)
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