YouScience Photography Certification Practice Exam

Lens distortion occurs when a lens maps straight lines in a scene to curved lines in the image, most noticeable with wide-angle lenses where lines near the edges bow outward (barrel distortion) or inward (pincushion distortion). In post-processing, you correct it by using lens corrections that know how a specific lens tends to distort. Applying lens profiles automatically compensates for the distortion by shifting pixels so straight lines become straight again. You can further fine-tune with a distortion control to adjust the amount, and in some tools you can manually switch between barrel and pincushion corrections. Many programs also offer automatic corrections based on camera and lens data, plus perspective tools to straighten verticals or horizontals if needed. This approach directly addresses the geometric warping of the image, unlike options that relate distortion to lighting artifacts or color fringing, which are separate issues.