Just an observation that had me puzzled for a while in ART.
When the ‘vignetting correction’ box is ticked under lens corrections, (not surprisingly) it brightens the outer portions of the images. However this seems to result in highlights being brightened so that they can no longer be recovered by any means.
I guess the simple answer is don’t tick the vignetting box if you want to recover highlights but I am just pointing it out, because it had me stumped as to why I sometimes couldn’t recover highlights.
Not sure about darktable, as the vignetting correction doesn’t seem to do anything. In RawTherapee, you can’t tick the vignetting correction box for my camera. Perhaps it is just an issue with the lensfun profile for my camera?