Take a picture of any sort of architecture with your iPhone and you're quickly confronted with the horrifying reality of the “keystone” effect. Instead of a glorious vision of parallel and perpendicular lines, your subject more resembles a trapezoid, with the top unceremoniously falling away from the viewer. For most photographers shooting with a traditional camera, the issue of perspective correction is easily addressed with Photoshop or Lightroom, or for the more serious architectural photographer, an expensive tilt-shift lens that can address perspective issues inside the lens itself, no software needed. Oddly, despite the keystone effect being such a frequently encountered problem by iPhone photographers, the solution for correcting it isn't addressed in leading photo editing apps.
There's an app for that
Which brings us to mjagielski's SKRWT, a standalone app focused squarely on correcting perspective and distortion issues quickly and easily. From a design perspective, SKRWT is brilliant, the icon is perfect, the UI, handsome and intuitive: a dark background for image contrast, and a horizontally scrolling icon based menu of correction options below. Tap a correction option and the menu is replaced by a scrolling dial of sorts that makes one-handed corrections super simple. A nice added touch here; just tap on the far left or right sides of the dial to make incremental changes and combine with SKRWT's “pinch to zoom” while editing for pure parallel perfection.
All the corrective edits are displayed live, and when implemented are processed quickly, so going back and forth between the various options is wonderfully painless. As for SKRWT's abilities, any photographer familiar with lens correction in Photoshop will be right at home, vertical distortion, horizontal distortion, rotate, barrel and pincushion, and vignette correction are all here, as well as a handy auto-crop feature that maximizes the remaining available image size as you edit. Finish your edit, then export a copy back to the camera roll or to Instagram.
As for negatives, I can't really come up with many, though it's possible that some would prefer more exporting options aside from Instagram. Outside that, SKRWT is perfect at doing what it does, simple and magically good perspective correction. It won't be a must-have for everyone, but for the detail-oriented iPhone photographer out there who on occasion takes his or her efforts seriously, SKRWT needs to be in your photography folder.
SKRWT by mjagielski's ($1.99) is available for iPhone.