Is this the exact conversion printers use?

This is the standard naive RGB-to-CMYK formula; professional printing uses ICC color profiles calibrated to specific inks and paper, which can shift the result somewhat.

RGB to CMYK Converter

Convert RGB color values into CMYK (cyan, magenta, yellow, key/black) percentages used for print production.

Inputs

Results

Cyan: 76.0%
Magenta: 47.2%
Yellow: 0.0%
Key (Black): 3.5%

Try an example

Formula

K = 1 − max(R,G,B); C,M,Y derived from remaining channel ratios

Learn How This Works

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