Flo's UnDistort filter

Flo's UnDistort is a plugin for correcting deformations of photographic images:

• Barrel and pincushion deformations
• Perspective deformations (keystone effect)
• Chromatic aberrations (also known as "color fringing")

In order to use it, you need an image editor that can use Photoshop-compatible plugins. The most well-known is Adobe Photoshop, but other image editors can be used, including IrfanView, a freeware utility.

The plugin works only on Windows platforms.

You may download a working copy of the filter in order to try it. The downloadable copy is completely functional for images smaller than about 800*600 pixels. For processing bigger images, you must purchase a full working version of the filter. The filter costs 15 €.

Latest news

January 12, 2009     Version 1.3, a couple of improvements: a "zoom" slider instead of fixed focal lengths, grid with changing colors... The plugin works on Vista now.

June 24, 2005     Finally, here comes version 1.0. The problem with the preview of 16-bit Grayscale images was corrected. The plugin is fairy stable, and deserves to be a full version, no longer a beta.

Forthcoming features may include auto sizing and positioning, a better handling of CA and speed improvements.

June 6, 2005     Here is version 0.7. Lots of improvements have been implemented:

• The filter now works for 16-bit images. A caveat: the preview in 16-bit Grayscale images doesn't display correctly; however, the filter runs correctly on the final image. This is basically the only reason I'm not calling this release as version 1.0.
• An "advanced" mode for chromatic aberration correction has been added. It allows for easily correction of non-symmetric chromatic aberrations. Here is how to use it:
  • Activate the "Advanced" checkbox. Zoom in — this is better performed at 100%, 2x or 3x zoom.
  • Choose one of the corners of the image where to perform the correction.
  Select this corner in the drop box and use the sliders to have the best result at this corner.
  • Then go to another corner and use the global X and Y sliders to adjust the correction there. While doing this, the correction in the first corner will be preserved.
• The filter window is resizable. There's no need anymore for several versions with different sizes. The window size is remembered between filter activations.
• Correction settings can be remembered between filter activations (even between different runs of the image editor). A checkbox activates or inactivates this behavior. When inactivated, corrections are reset at each invocation.

June 28, 2004     Version 0.5 is out (version 0.4 was never released). Changes from previous versions:

• Four versions of the filter exist now, each one having a different window size: Small, Normal, Big and Huge. Use the one you like the best, depending on the size/resolution of your screen and the performance of your computer.
• Two buttons allow for 200% and 300% zoom in the preview window. Using them together gives 600% zoom. This is very useful when correcting chromatic aberration.
• Lateral Chromatic Aberration sliders are 5 times more precise now. The amplitude of possible corrections becomes +/- 2% (in previous versions, this was +/- 10%). Normally, no lens produces a lateral chromatic aberration more than 2%.
• Performance has been slightly improved (about 15%).

January 3, 2004     A happy New Year! Version 0.3 was released. It includes support for saving and reloading filter settings. Some user interface bugs were also corrected.

December 6, 2003     The first release, version 0.2. This is still considered a beta version. Planned for the future: load/save settings capability, remember preferences, clear settings upon each launch, 16-bit support, auto scale and position.