The crop tool in Photoshop has an additional option that allows you to transform the perspective in an image. This is very useful when working with images that contain keystone distortion. Keystone distortion occurs when an object is photographed from an angle rather than from a straight-on view. For example, if you take a picture of a a tall building from ground level, the edges of the building appear closer at the top than they do at the bottom.
Note: You cannot transform the perspective of 16-bit-per-channel images.
Steps to transform perspective:
A. Draw initial cropping marquee B. Adjust cropping marquee to match the object's edges C. Extend the cropping bounds D. Final image
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