While RGB is the standard color model in Zakeke, you can have your print-ready files converted to CMYK if you need it. You'll need a file in icc format including the color profile to convert the output from RGB to CMYK.
Before you start
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A digital screen can't show true CMYK colors, computers and other devices use RGB to display color on the screen. Of course, it will be the same with Zakeke: even if you activate this add-on, your customers will continue to see RGB colors in the customizer. The Add-on only allows you to have a file converted to CMYK.
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Colors converted from RGB to CMYK may not be 100% accurate simply because no software can replicate CMYK colors exactly.
How to set the print-ready file in CMYK
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Go to Printing Methods.
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Create or edit a Printing Method.
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Scroll down to the section Print-ready Files and check "Use a custom CMYK profile for PDF output".
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Upload your .icc color profile (you can upload only CMYK profiles, no RGB or sRGB).