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143
Adobe Photoshop Help
Making Color and Tonal Adjustments
Using Help
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Contents
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143
With a high-key image, you might want to set the shadow to a higher value to
maintain detail in the highlights. Experiment with Brightness values between 4
and 20.
Original
Shadow set using average-key target brightness values (B: 4); and shadow set using higher target
brightness values (B: 20)
To use Threshold mode to identify the lightest and darkest areas in an image:
1
Open the Levels dialog box, and select Preview.
Note:
The Threshold mode in Levels is not available for CMYK images.
2
Hold down Alt (Windows) or Option (Mac OS), and drag the white or black Input Levels
triangle.
The image changes to Threshold mode, and a high-contrast preview image appears. The
visible areas of the image indicate the lightest parts of the image if you are dragging the
white slider, and the darkest parts if you are dragging the black slider. If a color channel is
selected in the Levels dialog box, the black area indicates where none of the given color
component exists.
Image preview in Threshold mode
3
Slowly drag the slider to the center of the histogram to identify the light or dark areas in
the image. Use these pixels for targeting the black point and white point in your image.