Using Polypad this script converts RGB to CMYK from your pasted text.
How to use RGB to CMYK?
Using the RGB to CMYK script with Polypad is very easy. Let’s say we have the rgb color red that we would like to convert. Simply paste the text down below into Polypad.
Press cmd/ctrl + p depending on your operating system and search for the RGB to CMYK script and select it. The expected output should read: