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Working with the Out-Of-Gamut Command
One of the biggest problems with images displayed on a computer monitor is that they don't accurately represent the color space of a 4-color press. There are ways that we can reduce the possibility of colors not printing correctly, but in the end the RGB and CMYK color spaces are differentin fact, they're exactly the opposite of each other. Photoshop understands this, and gives you a way to view out-of-gamut colors. The term Gamut is used to define a color that will reproduce on a press. The out-of-gamut test is performed on an image before the conversion into the CMYK mode. Once you convert an image to CMYK it's too late to test, because Photoshop has already made the conversion.
Work with the Out-Of-Gamut Command
Open an RGB image.
Click the Edit (Win) or Photoshop (Mac) menu, point to Preferences , and then click Transparency & Gamut .
Select a Gamut Warning color, and then enter an Opacity percentage value (1 to 100).Gamut Warning is the color Photoshop uses to mask the out-of-gamut areas of the image.
Click OK .
Click the View menu, and then click Gamut Warning .Photoshop displays any color outside the CMYK gamut with a predefined color mask.[View full size image]
[View full size image]
