I had emailed the lensfun authors about this and they said the instructions/hugin generally work but for some unknown reason some lenses don't seem to work well so it's important to double check your results. The centre almost always seemed fine regardless of the numbers it was the edge of the frame that was best to look at. The CA numbers, I ended up looking at the picture at 200% or so, and noticed the generated numbers were way too high, so I played around with those parameters till I understood which colour and direction was phased by which parameters and adjusted them so it was better. The numbers didn't come out very good though so I have to manually tweak them.įor the barrel distortion I ended up taking a picture of a grid on my monitor (kind if like the one you see on dpreview for showing barrel distortion) then tweaking the parameters till that became pretty much a perfect square. The correct numbers should be as per Indigo's post : (which explains why my hugin numbers didn't work, they did, just not with ufraw)
As a result the numbers I posted above are wrong, but work for UFRaw. It appears UFRaw doesn't take the crop factor into account. I had to hand tweak the numbers to get something relatively sane and useful.Īfter some discussion as per posts on here.
The TCA (chromatic aberration) correction numbers were about 4x too strong making the result worst than the original. The distortion correction results it gave me were way too weak, by about a factor of 4, doing almost nothing. Incidentally if anyone else is trying to generate lens correction data using hugin.
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