Repairing Keystoning Without the Crop Tool

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 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 just 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 building seems to be leaning ...

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