Expose more parameters for manual control in Lens Correction module about darktable HOT 10 CLOSED

This would be a very heavily used feature for me if added. I am constantly desiring to modify the distortion slightly or play with the amount of natural vignetting.

This would be most especially useful for new lenses that I've purchased that don't have lens correction data yet. I would at least be able to create a preset that imprecisely applies lens corrections while I create the lens correction data.

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LensFun does seem to be in a state of flux currently; maybe this will allow for any changes to the API that would facilitate this type of feature. When looking at the module source, my brain shut down quickly, but it appeared that the direct CA control was kind of a special case, and I couldn't see how it could be easily applied to the other parameters the same way, but it could be that I'm just stupid. ;)

In any case, I'm glad to hear there's interest in this. Another thing any module re-write might want to consider an additional tab for would be LensFun database updates. Variations on #2869 have become a FAQ at this point; the python script proposed as a solution doesn't really scale with darktable's increasing cross-platform popularity...

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I for one would find this very useful, especially since I like to work with scans of some uncommon lenses. Profiles are great, but having the ability to fine-tune would make things even better.

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This would be amazingly useful.

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I agree, this is a good idea.
It is something I played with recently while adding initial, experimental support for lensfun-next. :-) I was planning on extending lens correction module functionality by adding manual controls for other correction parameters and perhaps splitting the module functionality into "automatic" and "manual" tabs, plus cleaning the module logic a bit (to be discussed). Problem is that the new (next) version of lensfun change things around quite a bit in the transformation handling and lens profiles departaments and I would prefer to wait with implementing those changes until a new stable lensfun arrives. On the other hand, I don't think we'll get the new version anytime soon... :-( Anyway, I have this on my todo list.

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One thing that would be useful if the "Scale Factor To 35 mm Equivalent" exif parameter could be used to specify crop factor to lensfun -- at the moment just uses the camera model to look up the crop factor in the lensfundb, but some cameras these days allow crop mode to be enabled when a full frame lens is attached, and in that case the lensfun model will not be scaled corrected to the cropped size capture.

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This issue was closed because it has been inactive for 300 days since being marked as stale. Please check if the newest release or nightly build has it fixed. Please, create a new issue if the issue is not fixed.

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