1 Open the Threshold dialog box. (See "Making color adjustments" on page 132.)
3 To identify a representative highlight, drag the slider to the far right until the image becomes pure black. Drag the slider slowly toward the center until some solid white areas appear in the image, and place a color sampler on one of the areas.
4 To identify a representative shadow, drag the slider to the far left until the image becomes pure white. Drag the slider slowly toward the center until some solid black areas appear in the image, and place a color sampler on one of the areas.
5 Click Cancel to close the Threshold dialog box without applying changes to the image.
You can use the Info palette readouts of the two color samplers to determine your highlight and shadow values.
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