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How to fix a distorted square?

Nov 13, 2010, 08:45
Post: #1
Question How to fix a distorted square?
If the image of a square is slightly distorted, like a picture taken at an angle, is there an easy way to fix that distortion?

Exaggerated example.. http://image.wistatutor.com/content/feed/tvcs/quad3.jpg
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Nov 13, 2010, 09:30
Post: #2
RE: How to fix a distorted square?
The perspective tool is meant for this (in the toolbox, the trapezoid with arrows in the bottom corners). Use it in "corrective" mode, ie, you use the handles to show what should become a true rectangle in the final picture (make the side of the frame parallel to verticals/horizontals).

Word of caution: 1) it cuts the picture to the rectangle you've set. What is outside the rectangle is lost(*), and 2) by doing so one usually slightly distorts the aspect ratio of the image, so before applying, take a few distances with the measure tool, and, after applying, use the scale tool with X & Y unliked of course) to restore the proportions.

(*) a frequent use of the tool, as its name implies, is to correct the perspecitve of buildings in photography. One learns quickly to take a picture with enough room around the subject:-)

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Nov 13, 2010, 15:52
Post: #3
RE: How to fix a distorted square?
Great - thank you.
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