Lens distortion vs perspective: fix the right problem

Use two edges to diagnose the shape

Choose a doorway, shelf or building edge you know is straight. Follow the edge from end to end. Does it bow, or does it stay straight while leaning toward another edge? A photograph can contain both problems, so check more than one part of the frame.

Adobe describes barrel distortion as outward bowing and pincushion distortion as inward bending. Its Lens Correction controls also distinguish those optical corrections from perspective adjustments. The names are useful only when you connect them to a visible line.

Do not use a bent tree, fabric curtain or curved piece of furniture as proof of lens distortion. You need a trustworthy reference before trying to make the photograph geometrically tidy.

Match a correction to the actual file

Photoshop’s Lens Correction filter can use a camera/lens profile identified from metadata, with manual selection when the match is unavailable or wrong. Review that match rather than choosing whichever familiar lens name happens to appear.

For a processed phone photo or an exported file, the capture history may be less clear than it is for an original camera file. Compare before and after with extra care. If a previously straight reference bends after correction, undo the trial instead of assuming that enabling another option must be an improvement.

Separate curvature from convergence

1. Keep the starting version. Work from the best original available and retain a reference without the new geometry changes.
2. Inspect curvature first. Use an appropriate profile or a restrained distortion adjustment. Watch several reliable edges, including one near the frame boundary.
3. Reassess the straight lines. Once their curvature is acceptable, decide whether the remaining convergence needs a perspective adjustment. Do not use that second adjustment to chase a curve.
4. Review the new boundaries. Look for empty areas, lost edge content and a changed crop. Decide what composition remains useful before exporting.

Check more than a perfect doorway

Imagine a room photographed from near its entrance. The doorway can be a good reference, but the sofa, a round table and a person near the edge also matter. A version with tidier verticals is not automatically better if those subjects become awkwardly stretched or important context disappears.

Compare a modest correction with a more aggressive one. Hide the grid when making the final choice so the photograph, rather than the guides, determines which version you keep. For a personal interior photo, an understandable room may matter more than architectural precision.

If your main complaint is that a nearby face looks unusually prominent, do not expect a lens profile to make the camera viewpoint disappear. That is a different question from whether a straight shelf bows.

Keep the correction proportional to the purpose

A wide view can intentionally emphasize scale or height. Leave convergence when it supports that purpose. For documentation where straight geometry matters, a retake from a more suitable position may leave fewer compromises than a large transformation.

When you cannot identify the lens or verify the original edges, use a conservative visual correction and describe the result accordingly. Avoid treating a profile selection as evidence that the whole image now reproduces real-world dimensions accurately.