Assigning values to the and white points
blackYou can further improve the quality of the image by adjusting the black and white limits of its tonal range. In Lesson 3, “Basic Photo Corrections,” you learned to use the sliders on the Levels command histogram to adjust the range. In this lesson, you’ll control the range more accurately by using the Levels command eyedropper to assign specific values to the darkest and lightest points.
1. | Choose Image > Adjustments > Levels.
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2. | In the Levels dialog box, double-click the white eyedropper tool (  ) to open the color picker for the white point.
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3. | Enter 0, 0, 0, and 5 in the CMYK text boxes, and click ... |
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