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RGB to CMYK Converter

The same conversion as hex to CMYK, from decimal channel values. The same caveat applies: this is profile-free arithmetic, useful for reference and not a substitute for a proof.

How the conversion works

Divide each channel by 255. Key is 1 minus the largest result; the other three are each channel's shortfall from the maximum, normalised by 1 minus key.

Other converters

Hex → RGB RGB → Hex Hex → HSL HSL → Hex RGB → HSL Hex → HSV Hex → CMYK CMYK → RGB Hex → RGBA Hex → Pantone All formats at once →