Identifying out-of-gamut colors

Most scanned photographs contain RGB colors within the CMYK gamut, and changing the image to CMYK mode (which you’ll do later in order to print the file) converts all the colors with relatively little substitution. Images that are created or altered digitally, however, often contain RGB colors that are outside the CMYK gamut—for example, neon-colored logos and lights.

Note

Out-of-gamut colors are identified by an exclamation point next to the color swatch in the Color palette, the color picker, and the Info palette.


Before you convert an image from RGB to CMYK, you can preview the CMYK color values while still in RGB mode.

1.
Choose View > Gamut Warning to see out-of-gamut colors. Adobe Photoshop builds a color- conversion table and displays a neutral gray where the colors are out-of-gamut.

Because the gray can be hard to spot in the image, you’ll now convert it to a stronger gamut-warning color.

2.
Choose Edit > Preferences > Transparency & Gamut (Windows, Mac OS 9) or Photoshop > Preferences > Transparency & Gamut (Mac OS 10). Then click the Color sample at the bottom of the dialog box.

3.
Choose a vivid color, such as pink or a saturated clear blue, and click OK.

4.
Click OK again to close the Transparency & Gamut dialog box. The gray is replaced by the new color you chose.

5.
Choose View > Gamut Warning to turn off the preview of out-of-gamut colors.

Photoshop will automatically correct these out-of-gamut colors when you save the file in Photoshop EPS format later in this lesson. Photoshop EPS format changes the RGB image to CMYK, adjusting the RGB colors as needed to bring them into the CMYK color gamut.

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