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Chapter 8. Modern Problems: Dealing with... > Repairing Keystoning - Pg. 234

The Photoshop CS2 Book for Digital Photographers Repairing Keystoning Keystoning is often found in photos with buildings or tall objects, where the buildings look as if they're falling away from the viewer (giving the impression that the tops of these buildings are narrower than their bases). The Crop tool has a Perspective function that can be used to fix these distortions, but actually I'm going to recommend that you don't use it, because it doesn't offer a preview of any kind--you're left guessing--so use this technique instead. Step One: Open an image that has a keystoning problem (such as the photo shown here, taken with a wide-angle lens, where the towers of this old church seem to be leaning away from the viewer).