[Digikam-users] Pentax PEF vs DNG in digikam

sleepless sleeplessregulus at hetnet.nl
Tue Sep 27 18:42:11 BST 2011

Thanks Günter and Gilles. It is clear to me. I will stay away from DNG, 
no confusions anymore.
Op 27-09-11 17:37, Gilles Caulier schreef:
> 2011/9/27 Karl Günter Wünsch<kgw at mineralien-verkauf.de>:
>> On 09/27/11 14:37, sleepless wrote:
>>> Hi list,
>>> If I convert my PEF files to DNG, they look very different. DNG looks
>>> darker.
>>> It is both the same image, both RAW and both lossless. I think it should
>>> look the same. Can someone explain why it does not.
>> Because the conversion PEF to DNG loses meta data which will determine
>> how the image will be processed. In this context the conversion is a
>> lossy one!
> Definitively NO.
> DNG is not lossy format, especially metadata. All is preserved, as markernotes.
> The problem is the way  to demosaicing and post process DNG. It sound
> like not all process is done in DNG against PEF. This is why image is
> dark (no gamma and WB adjustements). These informations are taken in
> makernotes, of course.
> How to solve it. libraw used by digiKam must be patched in to use
> makernotes, for all possible camera makers. This is a huge job, not
> simple.
> Gilles Caulier
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