RGB to CMYK conversion in Illustrator is a simple process that can be completed in a few minutes. To begin, open Illustrator and click on the Colors palette. From the Colors palette, select the color you want to convert to CMYK. In this example, we will convert the blue color to cyan. To do this, select the Cyan color from the Colors palette and then click on the Convert button. The conversion process will take a few minutes and when it is complete, you will have a new color in your Illustrator file that is CMYK.