Post Processing Panoramas

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I used to use Photoshop’s Lens Correction filter to make vertical or horizontal lines parallel. But for the last couple of versions, Photoshop has provided the Adaptive Wide Angle filter, which is even more powerful. Lens Correction assumes there is a single vertical and a single horizontal direction and all of the image is modified relative to that. Adaptive Wide Angle overlays a mesh on the image, and different sections of the mesh can be distorted in different ways, allowing more sophisticated corrections.