The first step in using the perspective warp filter to straighten the perspective of a building Defining the planes of the building that need to be corrected.
It might be challenging to match the perspective of your cityscape to reality. If all you have is a conventional wide or ultra-wide lens, you'll run into trouble. Tilt-shift lenses are specialist wide-angle lenses with perspective adjustment. Your photo exhibits perspective distortion. Wide-angle lenses make it so that buildings tilt when you photograph enormous items. The picture is more susceptible to distortion the broader the lens.
You need a mix of superb in-camera imagery and post-processing perspective correction to make a picture that was taken look realistic. In some circumstances, you want to enhance or highlight distortion rather than represent reality in the image for emphasis.
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