The flat field correction eliminates that completely. PS is way too late in the workflow for this to be done accurately it should be done in the converter.Īs for color casts, one of the things that drove the solution in RawTherapee was the behavior of Michael's ZD system, where if the center is properly white balanced the edges show a decided greenish cast. I think the issue with Evening's method is that the correction should be applied in linear gamma, rather than on gamma-corrected images.
My sincere thanks to Emil Martinec, who wrote the flat field correction algorithm, Fabio Suprani for core of the the auto-selection algorithm and to the entire RawTherapee development team! RawTherapee is able to automatically select a closest match from a collection of Flat Field raw files stored in a dedicated folder. This allows for the same flat field file to be reused for correction of images shot under varying lighting conditions.Ĭorrections are done on the fly, without intermediate steps involving copies of the original file original raw file can be flat-field corrected during the RawTherapee development process itself.įlat Fields are characterized by the Camera Make & Model, Lens, aperture and Date&Time of the image.
The calculations are performed on linear raw image data algorithm is smart to normalize the white balance of the raw image (in the spot of the automatically located projection of the optical center even for misaligned lens mounts). The Flat Field correction tool in RawTherapee allows to fully correct the lens cast issue for any of the currently supported cameras and for any, even misaligned lens.īelow are a few images illustrating the results of using this tool.Ĭorrection is based on a reference Flat Field raw image - a defocused photograph of a uniformly lit uniformly colored and toned subject, such as a matte piece of white paper.įlat field data is blurred during the correction process using a user-selectable blur radius.
#Rawtherapee 2.4.1 software
I would like to share with everyone my limitless joy of using a new feature that has been recently added to RawTherapee (a powerful open source raw processor software As an owner of Mamiya ZD, I've had griefs over the lens cast issues, as, I am sure, many of the medium format users.
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