Inside Photoshop CS: Shadow/Highlight
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Advanced functionality
Beyond its simple slider adjustments for Shadow and Highlight values, the Shadow/Highlight function also provides a wide variety of tools for fine-tuning your adjustments. You can access these by clicking on the "Show More Options" checkbox at the bottom of the dialog.[an error occurred while processing this directive]
The Tonal Width settings allow you to to tighten or widen the range of tones that will be affected by your Shadow/Highlight adjustment. For example, you may want to bring out the details in t=only the darkest portions of your image, leaving some of the midrange elements alone, or you may want to brighten up more than just the darkest portions. The images below show examples of variations on the Tonal Width setting and their impact on neighboring tonal values.
Radius, on the other hand, does not target tonal values but instead allows you to adjust the area around each pixel in the adjustment. It's a bit more obscure than Tonal Width, but it can have a dramatic impact on the final result of your manipulation. The images below show variations on Radius. (Each uses a Shadow and Tonal Width value of 100.)
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