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Continue to ChatQuery : Conversion of RGB values to CMYK in InDesign concerning I experienced odd tints of grey-color after print out. Now I know, to avoid this and get clean grey color, only K value should be used https://vmapp.org/query/57288/Conversion-Of-RGB-Values-To-CMYK-In-InDesign-Concerning-I-Experienced-Odd-Tints-Of-Grey-Color-After-Print-Out-Now-I-Know-To-Avoid-This-And-Get-Clean-Grey-Color-Only-K-Value-Should-Be-Used/