RGB Converter
Converts colors between RGB, HEX, and CMYK, with a clear error message for invalid input.
The converter translates a color between RGB and two other notations: HEX code for the web and CMYK for print. The HEX conversion is exact. The CMYK conversion is approximate: print numbers depend on the paper and the print shop.
The input accepts a full color string or single channels. When a number is out of range or the notation has an error, the hint names the channel and the reason instead of showing a different color.
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