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Lesson 8. Correcting and Enhancing Digit... > Correcting image distortion

Correcting image distortion

The Lens Correction filter fixes common camera lens flaws, such as barrel and pincushion distortion, vignetting, and chromatic aberration. Barrel distortion is a lens defect that causes straight lines to bow out toward the edges of the image. Pincushion distortion is the opposite effect, where straight lines bend inward. Vignetting occurs when the edges of an image, especially the corners, are darker than the center. Finally, chromatic aberration appears as a color fringe along the edges of image objects.

Some lenses exhibit these defects depending on the focal length or the f-stop used. You can have the Lens Correction filter use settings based on the camera, lens, and focal length used to make the image. You can also use the filter to rotate an image or fix image perspective caused by vertical or horizontal camera tilt. The filter’s image grid makes these adjustments easier and more accurate than using the Transform command.


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