Video Tutorial: Selectively brighten shadow areas of an image using photoshop.

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Shadow/Highlights Masking with Photoshop CS4

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One of my all time favorite adjustments that I will perform on just about every single image is shadow/highlights.  This is a very simple tool that if used correctly, will yield incredible results.  The most important detail about this tool is that it CAN be overdone.  If you over do highlight recovery, you will lose your true whites, and if you overuse shadows, you will have a halo around the darker spots of your images.