All they really do is standardize color output... no matter what the device is. We run the Eye-One on all of our monitors and printers. It'll flash a bunch of colors on the computer screen while it simultaneously reads the color output of the monitor. For a printer it talks to your RIP and tells the printer to print a bunch of different swatches of color. Then you take the Eye-One (really just a simplified camera with a UV light in the lens) and run it over your swatches... it will read the CMYK output of each swatch and change your profile accordingly. In certain RIPS it allows you to hit CMYK PMS spot colors dead on.
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Does Genius prevail????