Adjusting Image Color And Tone - Adobe 13102498 - Photoshop CS3 - Mac User Manual

In RGB mode, you can tell whether a color is out of gamut in the following ways:
• In the Info palette, 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 palette, an alert triangle
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. You may prefer to
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.
1
Choose View > Gamut Warning.
2
All pixels outside the gamut of the current proof profile space are highlighted.
Change the gamut warning color
1 Do one of the following:
• (Windows) Choose Edit > Preferences > Transparency & Gamut.
• (Mac OS) Choose Photoshop > Preferences > Transparency & Gamut.
Under Gamut Warning, click the color box to display the Color Picker. Then choose a new warning color, and
2
click OK.
For best results, use a color that is not already present in the image.
3 Enter a value in the Opacity text 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

Adjusting image color and tone

Levels overview
You use the Levels dialog box to correct the tonal range and color balance of an image by adjusting intensity levels
of image shadows, midtones, and highlights. The Levels histogram is a visual guide for adjusting the image key tones.
For more information on how to read a histogram, see "About histograms" on page 151.
appears. When you select an out-of-gamut
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