Convert Red, Green, Blue values to Cyan, Magenta, Yellow, and Black for print. See CMYK and other formats in real time as you adjust RGB.
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RGB (Red, Green, Blue) is an additive color model. Screens and displays build color by combining red, green, and blue light. Each channel goes from 0 to 255.
CMYK (Cyan, Magenta, Yellow, Key/Black) is a subtractive model used in printing. Ink on paper absorbs light. Each ink is expressed as 0–100%.
RGB is normalized to 0–1, then Black (K) and CMY are derived:
R' = R/255, G' = G/255, B' = B/255
K = 1 - max(R', G', B')C = (1 - R' - K) / (1 - K)M = (1 - G' - K) / (1 - K)Y = (1 - B' - K) / (1 - K)
