Perform edits on separate layers

When you colour-correct on one layer, zap blemishes on another, whiten teeth on another, and so on, you can back out of any edit, anytime you want, even after closing the document. You can lower the opacity of individual edits to make changes look realistic (crucial in portrait retouching), and by using adjustment and fill layers, you automatically get a mask that lets you hide layer content from parts of the image.

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In fact, the first 16 commands in the Image > Adjustments menu are available as super-safe adjustment layers (choose Layer > New Adjustment Layer), wherein the change occurs on a separate layer that you can control. Adjustment layers also make it easy to duplicate an effect onto another image--simply drag and drop relevant layers into another open document. In a pinch, duplicate the original layer and edit it instead

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