CORRECTING PERSPECTIVE DISTORTION
as perspective distortion isn’t related to any lens or camera, there are no default corrections that can be applied – it all depends on the distance between camera and subject and how far from parallel the camera is from the subject. perspective correction is often applied manually, by shifting the vertical and horizontal axis of the image. There are, however, clever software tricks that can help you along the way. adobe lightroom and adobe Camera raw have some of the most simple and effective perspective correction tools built- in. lightroom's Transform tab offers plenty of automatic and manual controls to suit. These automatic tools read the image and look for strong vertical or horizontal lines, using these as a reference to straighten the image. you can then select whether you wish to correct Vertical or level ( horizontal) distortion, or full ( both axis). depending on the image, this can be too extreme, so the best option is often to use the auto function, which applies a medium amount of correction – often the image isn’t completely corrected, but enough to be a marked improvement on the original.
another powerful option is using the guided controls – using the guided upright tool to place vertical and horizontal lines on the image, you’re effectively telling the software what vertical and level is. lightroom them contorts the image to fit these guides. The more extreme the perspective distortion, the more difficult it can be to correct, and the more you'll have to crop in to an image to fix it. also, excessive perspective correction can result in unusual- looking images. as with many editing practices, a little often looks much better than a lot.