ShiftN

What is ShiftN?

ShiftN corrects the leaning verticals that appear when a camera is tilted upward toward a building. It detects likely architectural edges and calculates a perspective correction, with an option to correct camera rotation too. The publisher's ShiftN 5.0 package is a 64-bit Windows 10/11 installer, offered as freeware under the LGPL.

Open a photograph through File | Open or drag it into the window, then choose Automatic correction. Page Up and Page Down switch between the original and corrected views. If an unrelated edge affects the result, exclude that line in the right-hand line display and choose Re-optimize. Adjust correction provides manual controls for shift, rotation, distortion and horizontal shortening when the automatic result needs refinement.

ShiftN reads JPEG, TIFF, PNG and BMP images and saves JPEG, BMP or TIFF. File | Batch processing handles multiple selected photos and asks for an output folder. The separate Batch processing parameter reuses the current image's shift and rotation rather than detecting lines afresh in every photo, so check that setting before processing unrelated views.

Perspective correction leaves empty areas around the transformed picture. Automatic trimming removes those areas but can crop important details or change the aspect ratio; a manual selection gives more control. Save results normally adds _ShiftN to the filename. Keep a nonempty suffix or use Save as if you want to preserve the original: clearing the suffix makes Save results overwrite it.

The publisher's illustration shows the photo workspace beside a detected-line view. Its application build is not identified, so it should not be treated as proof of the exact appearance of version 5.0. This description is based on publisher documentation, not an installation or hands-on test.

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