Identify out - of - gamut colors – Adobe Photoshop CC 2014 v.14.xx User Manual
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Although you can perform all color and tonal corrections in RGB mode and most adjustments in CMYK mode, choose a mode carefully. Avoid
multiple conversions between modes, because color values are rounded and lost with each conversion. Don’t convert RGB images to CMYK mode
if they are meant for on-screen display. For CMYK images that are separated and printed, do not make color corrections in RGB mode.
If you must convert your image from one mode to another, perform most of your tonal and color corrections in RGB mode. You can then use
CMYK mode for fine-tuning. The advantages of working in RGB mode are:
RGB has fewer channels. As a result, your computer uses less memory.
RGB has a wider range of colors than CMYK, and more colors are likely to be preserved after adjustments.
You can soft proof colors to see an on-screen preview of how your document’s colors will look when reproduced on a particular output
device. See
You can edit an image in RGB mode in one window and view the same image in CMYK colors in another window. Choose Window > Arrange
> New Window For (Filename) to open a second window. Select the Working CMYK option for Proof Setup, then choose the Proof Color
command to turn on the CMYK preview in one of the windows.
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.
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