Using Aperture, is it possible to do perspective or parallax correction? Say I've taken a photo of a rectange and the angles of the rectangle need to be adjusted so that each corner is 90 degrees.

Using Aperture, is it possible to do perspective (or parallax) correction? Say I've taken a photo of a rectange, a painting for example, and the angles of the rectangle need to be adjusted so that each corner is 90 degrees. When I was using a PC, I often did this with Corel Paint Show Pro, which makes this an easy job, but now I'm using MacBook with Aperture and have so far failed to find this feature.

Aperture seems to maintain a one-to-one correspondence between imported pixels and pixels in adjusted Images.  Distorting the Image creates a one-to-many relationship.  My guess is that this introduces the need for a second level of information storage (in fact, a whole new file).  Aperture is expressly designed to avoid that.
I'm just guessing about Aperture (having felt all around it, but still blindfolded), but I thought it might help to comprehend this basic limitation of Aperture and how it determines the workflow one uses for Aperture.

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