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.
--
Torsten Bronger Jabber ID: [email protected]
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