Originally Posted by Ken Fournelle
While looking at Frank's fine image of the museum I noticed it could use a bit of perspective correction. I am often confronted with this dilemma retouching exteriors of buildings. One method of correction is the Lens Correction feature listed under Filters>Distort. While I can get one side vertical the opposite side will not. I used one or two points of Remove distortion and the Vertical Perspective slider. To make both sides vertical I resorted to the Distort feature under Edit>Transitions>Distortto pull the one side vertical using Guides, as vertical and horizontal "guides". Then back into Lens Correction for a couple of pts. of Remove Distortion. Any others have thoughts on this?
There is another good way to fix perspective problems in photographs, IF you are using Photoshop. Just select the Crop tool and draw out a selection that will include everything you want to keep in the image. However, you must then put a check in the box in the options bar that says "perspective." Now all you need do is click and drag outward on any of the corner control handles. When you are satisfied with the fix, simply double-click in the image or go to Image > Crop to complete the process (just like you would normally do to apply a crop to an image).
With a little practice, you will find that this tool is very effective and a fast way to fix this type of distortion.