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The K in the CMYK colour model

The key to a good print

K for key is the black in the CMYK colour model and should really be abbreviated with 'B' for black. Since the German RGB colour model already has a 'B' for blue in it, the black is therefore represented by 'K'. In the printing process K is the key plate on which the other colours are aligned. The three primary colours CMY should theoretically produce black, but this black appears impure, a good print therefore needs the key percentage of black, K.

Text: Tizia Koese

Foto: Gmund


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