Torsten Bronger schrieb am 04.08.2016 um 10:58: > Hallöchen! > > Hartmut Knaack writes: > >> Appearance >> ========== >> >> Following Torsten Brongers calibration guide, I took Raw photos of >> a modern building with my Canon Powershot SX160 IS using CHDK. The >> TIFF files created by calibrate.py were processed with the method >> described in the vimeo tutorial. This way, I created my custom >> lensfun.xml file [2]. When opening one of the Raw photos [1] in >> ufraw and selecting my camera model, it is visible that the image >> is insufficiently undistorted[3]. Hugin however does a proper >> undistortion, when provided with the a, b and c parameter from >> lensfun.xml. By trying out some older versions of lensfun, it >> appeared that versions prior to January 1st 2014 were undistorted >> properly [4]. > > I made own measurements with Hugin (and git almost exactly your > results), and tested it in Darktable. With > > <lensdatabase version="1"> > > <camera> > <maker>Canon</maker> > <model>Canon PowerShot SX160 IS</model> > <model lang="en">PowerShot SX160 IS</model> > <mount>canonSX160IS</mount> > <cropfactor>5.6</cropfactor> > </camera> > > <lens> > <maker>Canon</maker> > <model>Standard</model> > <mount>canonSX160IS</mount> > <cropfactor>5.6</cropfactor> > <aspect-ratio>4:3</aspect-ratio> > <calibration> > <distortion model="ptlens" focal="5" a="0.02939" b="-0.11747" > c="0.01515"/> > </calibration> > </lens> > > </lensdatabase> > > I get perfect correction of your 5mm sample. Does this XML excerpt > work with your UFRaw? > > Tschö, > Torsten. >
Thanks Torsten, I installed Lensfun 0.3.2, ufraw 0.22 and Darktable 2.0.5 from my distribution (Opensuse Tumbleweed) and can confirm that Darktable does proper correction (I have no idea why it didn't do so when I tested it a month ago). ufraw however still doesn't correct distortion sufficiently. So, it seems to be a ufraw bug. I'll have a look there, but it might just be time for me to move over to Darktable. Thanks for your help. Hartmut ------------------------------------------------------------------------------ _______________________________________________ Lensfun-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/lensfun-users
