Adobe Photoshop CS6, User Manual

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Identify out - of - gamut colors
A gamut is the range of colors that a color system can display or print. A color that can be displayed in RGB could be out of gamut , and therefore
unprintable, for your CMYK setting.
In RGB mode, you can tell whether a color is out of gamut in the following ways:
In the Info panel, an exclamation point appears next to the CMYK values whenever you move the pointer over an out - of - gamut color.
In both the Color Picker and the Color panel, an alert triangle appears. When you select an out - of - gamut color, the closest CMYK
equivalent is displayed. To select the CMYK equivalent, click the triangle or the color patch.
Photoshop automatically brings all colors into gamut when you convert an RGB image to CMYK. Note that some detail in the image may be
lost, depending on your conversion options. You can identify the out
-
of
-
gamut colors in an image or correct them manually before converting
to CMYK. You can use the Gamut Warning command to highlight out
-
of
-
gamut colors.
Find out - of - gamut colors
1. Choose View > Proof Setup, then choose the proof profile on which you want to base the gamut warning.
2. Choose View > Gamut Warning.
All pixels outside the gamut of the current proof profile space are highlighted in gray.
Change the gamut warning color
1. Do one of the following:
(Windows) Choose Edit > Preferences > Transparency & Gamut.
(Mac OS) Choose Photoshop > Preferences > Transparency & Gamut.
2. Under Gamut Warning, click the color box to display the Color Picker. Then choose a new warning color, and click OK.
For best results, use a color that is not already present in the image.
3. Enter a value in the Opacity box, then click OK.
Use this option to reveal more or less of the underlying image through the warning color. Values can range from 1 % to 100%.
Original image, and out - of - gamut colors preview with blue selected for gamut warning color