On Monday, 7 January 2019 15:49:55 CET Jim Robinson wrote:
> I am trying to determine the vignetting corrections for a new lens (Laowa
> 7.5mm F2.0 MFT) using using the lens_calibrate.py program and images taken
> through a translucent sheet. I appreciate that with a very wide angle lens
> like this it might overestimate the vignetting, but that is not the
> problem. I run the program and get the lensfun.xml file which I then add
> to the lensfun database (there is already an entry there for this lens for
> chromatic abberation and distortion). If I then use darktable to apply this
> correction to either the .pbm or .pgm files produced by lens_calibrate the
> correction is very good (as it is for a 16bit tiff exported directly from
> the demosaiced raw without any other processing) However if I apply it to
> the original raw file (Olympus .orf) the correction is very poor with only
> about half the degree of correction required being made (though it does
> seem to be consistently out by proportionally the same amount). Thinking
> this might be a darktable problem I then tried rawtherapee and ufraw, but
> they both had the same problem with the raw file. Does anyone have any
> ideas what might be going on, or has anyone seen anything similar?
> Obviously I will raise this with darktable developers (my preferred
> application), but given that rawtherapee and and ufraw behave in the same
> way there may be a generic problem.
Could you please check with the latest version of the script. I've commited a
fix.
Thanks,
Andreas
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