Chromatic Aberrations

Free mitigation software

RawTherapee - on GitHub

Despite the name, also works on e.g. JPEG files.
A beginner’s guide
can use Lensfun profiles, but also custom .pp3 and .lcp profiles...
- Creating processing profiles

Darktable

More modern UI than RawTherapee, but IMO too invasive
- wants to manage all images...

Hugin

Hugin lens correction model
How to create lens distortion models with Hugin
  Radial shift by third order polynomials is used by e.g. Panorama Tools
 

command-line tool tca_correct estimates fulla correction parameters
  source code here

• can generate custom Lensfun profiles e.g. for RawTherapee
• -o optvar options abcvde;  de are not explained
• Lensfun describes Hugin's fourth order polynomial model:
    Rd = a * Ru^4 + b * Ru^3 + c * Ru^2 + v * Ru
• supported file types are not enumerated
• JPEG are accepted, but tutorial warns,
  "trying to correct chromatic aberration of a JPEG photo is a big waste of time".

command-line tool fulla applies tca_correct corrections
  source code here
  example corrections for an image series

Lensfun on GitHub

Lens Calibration
API and sample code

Picture Window Pro has manual chromatic aberration color fringing correction

that works on JPEG images.

related downloads

- CA settings can be saved and applied to subsequent images.

corrCA - C++ estimation and correction tool from Victoria Rudakova

calibration target similar to negative of a microscope calibration slide:

Transverse chromatic aberration image correction by color plane warping.
Precise (largely sub-pixel) color channel realignment by:
- high precision disk center detection in each color plane
- fit to radial polynomials.
Setup uses a single snapshot of black disks pattern on white.
Quantitative measurements on real images show that this method allows
- 0.05 pixel color channel average misalignment
- residual color error reduced by a factor 3 to 6.
GitHub - paper - Contact

tca_correct + fulla CA reduction

Using this calibration slide:

$ ./tca_correct.exe -o abcv M6Inf100.jpg
-r -0.0067386:0.0212854:-0.0208362:1.0044219 -b 0.0008056:-0.0013794:0.0010140:1.0003604
$ ./fulla.exe -r -0.0067386:0.0212854:-0.0208362:1.0044219 \
 -b 0.0008056:-0.0013794:0.0010140:1.0003604 \
 -o correctedM6Inf100.jpg M6Inf100.jpg
Saving correctedM6Inf100.jpg without alpha channel
because the fileformat does not support
an alpha channel.