#DARKTABLE LENS CORRECTION HOW TO#
How to handle the unlikely case where a profile using other models was loaded would be an open question in the short term I think simply disabling the controls (perhaps with a way to explicitly activate them to override the profile) would be good enough. There may be some uncommonly used models implemented in LensFun, but in practice the profiles generally (all in the current database, AFAIK) use ptlens/pol圓 for distortion, pol圓 for TCA, and pa for vignetting. However, given the space used by some modules, and the fact that this one doesn't offer a "blending" section, it might not be unreasonable to display a full set by default, as long as they were slightly distinguished from the more universally relevant "mm", "f/", and "d" etc information at the top. If showing the full set of sliders for all parameters of the more complex versions of the polynomials (a, b, c of "ptlens" distortion model and br, vr, bb, vb for complex TCA correction, etc) is considered too "busy" then perhaps a "simple" mode could be shown by default, whith a checkbox for "complex mode". Ideally, these sliders would always display the actual current values being applied, unlike the current implementation of the TCA sliders, where they show "1.00000" even after a profile is applied, and upon manually changing one value, both shown replace whatever was previously applied, which can be considered a confusing behavior, I think. Provide a useful tool for those producing lens profiles for the LensFun project, allowing to fine-tune parameters in a way that is very awkward and unintuitive to do in Hugin.Feel free to turn on your highlight over exposure guide and shadow under exposure guide. Spend time getting the exposure correct as it makes everything else easier when it’s accurate. Allow a user to make some correction for images where no profile is available. Make sure that firstly you adjust the (1) lens correction and the (2) exposure setting.Allow a user to adjust the results from an existing lens profile, for whatever reason (sometimes full correction of vignetting isn't desired, for instance).The Lens Correction module in darktable could be made more useful by adding manual adjustment for distortion and vignetting parameters, similar to those that already exist for TCA.
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