[Digikam-users] Questions on RAW conversion: Base curve
caulier.gilles at gmail.com
Wed Sep 11 11:16:49 BST 2013
2013/9/11 Marie-Noëlle Augendre <mnaugendre at gmail.com>
> 2013/9/11 Gilles Caulier <caulier.gilles at gmail.com>
>> In BQM, since 3.3.0 (if i remember), i implemented a way to extract
>> embeded JPEG with RAW workflow. Check BQM queue settings for details.
>> In this case, there is no demosaicing and processing is very fast.
>> Gilles Caulier
> I don't know how it does it, but each time I've needed a "quick" JPEG
> without actually "working" from the RAW, the BQM has given me a pretty good
> result that I didn't need to modify afterwards.
> For me, one more reason to never use RAW+JPEG as Digikam can do the job
> well and in an instant. :-)
If you don't use RAW Jpeg extraction option in BQM, and if you use "Auto
Brightness" option from WB section, libraw will emulate the famous
automatic curve from dcraw which give a very good results in 90% of cases.
dcraw only support this automatic mode in 8 bits per color per pixels. I
work with libraw team to extend this mode in 16 bits/color/pixels, to have
an homogeneous behavior.
Note : if "Auto Brightness" is disable, a linear curve is used instead.
This is why raw demosaicing is generally a black hole result on screen, and
need post processing curve adjustments, which can be done with Curve tool.
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