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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- Choose
View > Proof Setup, then choose the proof profile on
which you want to base the gamut warning.
- Choose View > Gamut Warning.
All pixels outside the gamut of the current proof
profile space are highlighted in gray.
Change the gamut warning color- Do one of the following:
- 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.
- 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
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PDF (adobe.com)
