> On 28 May 2019, at 01:11, Torsten Bronger <bron...@physik.rwth-aachen.de> > wrote: > > Hallöchen! > > Iain Wood writes: > >>> On 27 May 2019, at 19:40, Torsten Bronger <bron...@physik.rwth-aachen.de> >>> wrote: >>> >>> Iain Wood writes: >>> >>>> I have spent many hours attempting to reproduce fisheye-hemi >>>> using lensfun inside darktable. I couldn't get anywhere close to >>>> it. >>> >>> I don’t known how close you get, but "equirectangular" and >>> "panoramic" are two projections that explicitly don’t address >>> lens faults but should look good. >> >> Yeah, tried those. They are better than nothing, but nowhere close >> to fisheye-hemi. > > I am pretty sure that all that is really missing is the perspective > correction of the image before the projection change. Lensfun can > already do that but it will take some time to bring it into DT. >
Pretty sure that won't do it either. I have tried using the perspective correction module in combination with lens correction, and again, it helps, but gets nowhere near fisheye-hemi. It looks like lensfun perspective correction offers similar functionality, where the transforms are all linear along any given axis. This is a check pattern fed through fisheye-hemi: http://soulflyer.co.uk/grid-small-fisheye-hemi.jpg <http://soulflyer.co.uk/grid-small-fisheye-hemi.jpg> (sorry its a bit painful to look at, I should have used grey not black and white) I'm pretty sure that no combination of barrel distortion, pincushion distortion and perspective correction could produce that effect. I've certainly spent a long time trying, in darktable, gimp and a few other places. Hugin might be able to do it, but the setup required would be complicated. I might be able to get imagemagick to do it too. But what makes fisheye-hemi so useful is that it is a one click process, and part of the workflow for programs that support it. This really would be a very useful addition for those that like to use fisheye lenses for the wide field of view rather than the artistic distortion they produce. Iain ___________________________________________________________________________ darktable developer mailing list to unsubscribe send a mail to darktable-dev+unsubscr...@lists.darktable.org
