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