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Perspective correction for regular photo
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Just to try to clarify a little - When you take a photo, you are capturing things in 3 dimensions. Perspective is something which we use to simulate the effects of these 3 dimensions, but doesn't control the actual depth of a scene, of course. Everything that you look at, in that photo, will have the effects of perspective applied in all directions, as each object in the photo is 3D. Photoshop's perspective transform tool is a very simple symmetrical skewing tool, and can ony simulate a simple distortion to recreate the effects of perspecitve on a [b]single 2d object[/b]. It has no concept of the various effects of perspective which are inherently captured in any photograph, and therefore cannot accurately correct them. Two objects being on the 'same plain' and therefore being able to be corrected simultaneously only applies if the camera and the foreground object are alreay perfectly aligned with the background, in which case no correction would be needed anyway...
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