Some colors in the RGB, HSB, and Lab color models, such as neon colors, cannot be printed because they have no equivalents in the CMYK model. When you select a nonprintable color, an alert triangle appears in the Color Picker dialog box and in the Color palette. The closest CMYK equivalent is displayed below the triangle. (See "Identifying out-of-gamut colors (Photoshop)" on page 136.)
Note: The alert triangle is not available if you've chosen to use Web-safe sliders.
Printable colors are determined by your current CMYK working space as defined in the Color Settings dialog box.
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