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Editing perspective is essentially like editing collinearity in two dimensions at once. This is the tool to use when you are having trouble straightening doors, windows, bulletin boards, or other rectangular objects.
When you activate the Perspective tool, a rectangle made of dashed lines is shown within the image. You then line it up with the object to be straightened and click Apply.
Editing perspective changes an image’s proportions somewhat, so an image that has been edited with this tool must be cropped to eliminate empty space on its edges. For minor edits, the Auto Crop option, which is on by default, should be sufficient.