[Digikam-users] PowerShot S100 RAW pictures not treated properly

[Jeremy D Rogers]

Aha! I was thinking of looking into distortion correction. The idea was
interesting, but I had no immediate need so I never looking very deeply
into this. The s100 may be a good excuse to tackle it. If nobody beats me
to it, I may take a run at this over the weekend. Thanks for the link,
Marie-Noelle.

On Thu, Mar 8, 2012 at 10:16 AM, Marie-Noëlle Augendre <mnaugendre at gmail.com
> wrote:

> Regarding the white balance, you can find here a whole set of pictures
> taken with different white balances:
> http://www.marie-noelle-augendre.com/fichiers/Darktable/
>
> I provided them for the Darktable team to solve the same problem. They
> managed to correct the white-balance (it is OK now in Darktable RC1
> version) but the lens distorsion problem remains.
> i just got this answer on the DT list:
> "Darktable uses Lensfun for lens correction. Apparently lensfun has no
> correction data for the S100...
> You can calibrate it yourself:
> http://lensfun.berlios.de/lens-calibration/ "
> but I don't think I'll be able to do that. I'd rather someone more tech
> than I am do it.
>
> Marie-Noëlle
>
>
>
> 2012/3/8 JD Rogers <rogersjd at gmail.com>
>
>> I think that raw view is correct. It is raw, afterall. I wasn't so sure
>> about the magenta tint (when I first read your post, I was thinking there
>> was a dcraw version problem) but that could just be the effect of the white
>> balance. Looking at your photo, it doesn't seem any worse than my test
>> images. The distortion is dramatic for the s100's lens. I was reading about
>> it some before I bought the camera. My understanding is that the in-camera
>> processor corrects the distortion for jpg (and hence for the raw thumbnail
>> preview). But raw is raw. And its pretty dramatic! The camera even has
>> several "creative settings" like fisheye, toy camera, and minature effect
>> that apparently alter how much distortion is corrected.
>>
>> I hadn't played with raw on this camera much yet, so you've inspired me
>> to look at it more. The distortion depends heavily on the focal length
>> (zoom) of the lens, so the question is weather the digikam distortion
>> correction can be setup to handle it. I just tried the lens auto-correction
>> in the batch queue manager using "meta data" and it failed, but I've never
>> used that before, so I have to play with it more.
>>
>> I guess the details of this lens must be entered into a lens library?
>>
>> JDR
>>
>>
>>
>>
>
> --
> <http://www.marie-noelle-augendre.com/photos/>
>
> Mes dernières photos sont dans ma galerie<http://www.marie-noelle-augendre.com/photos/>
> .
> Retrouvez-moi aussi sur mon blog <http://www.mnaugendre.com/>.
> Et parcourez les Cévennes à ma façon avec Cévennes Plurielles<http://www.cevennes-plurielles.com/>,
>
>
>
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