Hi, The left/first is from the camera and the right/second is from darktable/lensfun.
Thanks for the guess. It would be unfortunate if it was the logic and not just the parameters of the correction that were different. I've looked over the calibration docs from lensfun and have been looking around for places to take good calibration images in the hopes that they just didn't have enough to work with. But that won't be sufficient if the algorithm is different. Cheers, -- Scott On Wed, Oct 28, 2015, at 12:33 AM, Robert William Hutton wrote: > Which image is which? > > As a first guess I'd say that lensfun might not be producing as good > results as AFAIK it doesn't > take into account subject distance (i.e. the focus distance) into account > when creating the lens > profiles. This can cause some slight differences in the correction > required (for close subjects vs > far away subjects). Lensfun uses the same correction for all images; your > camera may be doing > something a bit more sophisticated. > > Just a guess. > > -R > > On 23/10/15 11:14, Scott V McGuire wrote: > > Hi, > > > > I suspect this will be something for the lensfun project, but I'll start > > here. I was comparing my results from raw files I processed in > > darktable to jpegs from the camera when I noticed straight lines seeming > > to flex when I switched back and forth. Looking closely, the straight > > lines out of darktable aren't quite as straight as those from the > > camera's jpegs. I took this with a Sony a6000 using the kit lens which > > I know from reviews to be extremely distorted without correction. Maybe > > that makes correction especially difficult. > > > > Examples are here: https://scottvmcguire.smugmug.com/Distortion-Example/ > > and the xmp is attached. (This is the same image I asked about in a > > previous message for different reasons.) I can provide the raw file too > > if it will help. I was using 1.6.8 but I also tried the git master and > > the results were the same. > > > > Thanks, > > > > > > > > ------------------------------------------------------------------------------ > > > > > > > > _______________________________________________ > > Darktable-users mailing list > > Darktable-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/darktable-users > > ------------------------------------------------------------------------------ _______________________________________________ Darktable-users mailing list Darktable-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/darktable-users
