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Using the Hue/Saturation for Out-Of-Gamut Colors
Once you've established your document contains colors outside the CMYK color space, it's up to you to decide exactly how to correct the problem. There are as many ways to correct color problems as there are tools, and each Photoshop user has their favorites. Two methods that are simple and powerful, are using the Hue/Saturation Adjustment, and Photoshop's Sponge tool. Understand that the primary reason a color won't move into the CMYK color space is due to the saturation values of the ink. A monitor can produce more saturation to a pixel, than a 4-color press can produce by mixing inks.
Use the Hue/Saturation Method
Open an RGB image.
Click the View menu, and then click Gamut Warning .Photoshop displays any color outside the CMYK gamut with a predefined color mask.
Click the Image menu, point to Adjustments , and then click Hue/Saturation .
Drag the Saturation slider to the left until all the gamut masks disappear.
Record the Saturation Value used.
Click Cancel .
Click the Select menu, and then click Color Range .
Click the Select list arrow, and then click Out-Of-Gamut .
Click OK .The out-of-gamut areas of the image are now selected, and isolated from the rest of the image.
Click the Select menu, and then click Feather .
Enter a Feather value of .5.This softens the desaturation of the out-of-gamut areas of the image.
Click OK .
Click the Image menu, point to Adjustments , and then click Hue/Saturation .
Enter the Saturation value you recorded from step 5.
Click OK .
Press Ctrl+D (Win) or 
(Mac) to deselect the image areas.The image is now ready for conversion to CMYK.[View full size image]
[View full size image]
