So, I'm using Illustrator (newbie) and I'm having to match a color. The customer provided me with these color numbers to print and match by. When I put in the given CMYK, it prints pretty well but is not close enough to a perfect match. So then I type in the given RGB, and I notice that Illustrator will not let me keep those percentages, it says that it is out of the color gamut and corrects my numbers. These numbers come from a corporate client and I wouldn't think their numbers are bogus. How should I best try to match these colors. I obviously can keep printing little swatches and tweaking, but what is the BEST method? CMYK? RGB and let it adjust to the gamut? Do you use your Pantone guide?