This was easier for the developers since the new module depended on outside 3rd party libraries to provide the internals (specifically, exiv2 for lens ID recognition and liblensfun for the corrections) and they were freed from its maintenance costs. But they decided to borrow code for automatic lens correction (from the rawtherapee project, I believe). I remember about 5 years ago, darktable did have a manual lens correction module. Unfortunately, redmine is down at the moment for some reason so I am unable to check the status of this request. In fact, there is a feature request for a manual lens correction module in the darktable redmine system already (#9087). You aren't the first to ask this question. This won't prevent me from continuing my move to Darktable, but I feel it's a fundamental flaw in what is otherwise an outstanding RAW development tool.
This works well enough, but it adds what I feel are unnecessary steps to what should really be a simple "darkroom requirement".Īm I missing something, or is Darktable missing something? I'm hoping it's the former, but beginning to suspect it may be the latter! The only way I can achieve this right now is to export my image to a TIFF file, load it into GIMP, and use the lens distortion tool there.
But I can't find such a tool in Darktable. In Lightroom 6, I can manually adjust for simple barrel and pin-cushion distortion without having to select a lens profile, and with prime lenses this is more than enough to get the desired result. In any case, sometimes I don't want perfect correction, but a bespoke adjustment for the photo in question. I know that, for as-yet-unprofiled lenses, I can provide sample photos and request that a new one is created - but, that's time consuming. Darktable has the "Lens Correction" (Lensfun) tool, but that relies on already-existing profiles. not to a huge degree, but sometimes enough that I want to correct it. Some of these lenses exhibit barrel or pin-cushion distortion. I should explain, I shoot a *lot* of different lenses - mostly vintage Soviet glass, but plenty of other stuff too. However, there's one processing function I just can't seem to find an equivalent for, and it's making my workflow very clunky. I love it, and (for me) it's easily capable of replacing Lightroom 6 - at least so far as RAW development is concerned. So, after trialling Darktable 2.2.5 under Linux Mint for a few days, I'm completely sold.
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