[Digikam-users] 16bit editiing and auto-whitebalance

Lawrence Plug ljp at dal.ca
Fri May 9 15:33:38 BST 2008

Hi Benjamin and Elle,

Digikam* displays the low-res jpeg that is embedded in raw files, 
both as a thumbnail and as a single-click enlarged preview. At 
least it does for Nikon D300 and D70 NEFs and for Oly E-1 and E-3 
ORFs. Those are all the cameras I've tried.  So I'm not sure why 
Elle's step 2 is necessary? Am I missing something? Besides 
digikam, many other apps display the lowres jpeg as well. As elle 
notes, the embedded jpeg does have the camera's gamma and 
'cookbook' recipe applied, and in my experience composition, 
exposure, and gross sharpness/focus problems can be detected from 
this lowres image.

Regarding step 1 --raw + jpeg-- I usually do that too, even 
though the raw preview is available. It is a better criteria for 
selecting which to develop.


(*applies to digikam 0.9.2  to 0.9.4)

On Fri, May 09, 2008 at 04:51:57AM -0700, elle stone wrote:
> Benjamin Schindler wrote:
> > The thing is... I don't know in advance which picture I'm going to
> > manipulate. This means that I'll shoot everything in raw which makes
> > processing every picture using dcraw extremely time-consuming. 
> > To me, it seems this first step is kinda hard to do nicely on linux atm. I
> > wasn't able to get ViewNX/CaptureNX to work in wine, 
> > So this is kinda bad atm
> >
> Quoted from: 
> http://www.nabble.com/16bit-editiing-and-auto-whitebalance-tp16701397p17143601.html
> Hi, Benjamin,
> I have a few suggestions regarding previewing images before selecting the
> "good ones" - I'm a Canon user, so some suggestions might not be applicable
> to you.
> 1. My Canon 400d offers the option of shooting each picture both in raw and
> as a low, medium, or high quality jpeg.  Does the Nikon have a similar
> option?  
> 2. Also, my canon raw files all contain a very low res jpeg embedded in the
> file.  I use dcraw to extract the jpeg.  The command is: 
> /usr/local/dcraw/dcraw -e /media/process/ingest/*.CR2
> That is, I have dcraw installed locally, so the first part of the command is
> the path to the local installation executable "/usr/local/dcraw/dcraw" then
> the option "-e" for "extract" and then the path to where the raw images are
> stored "/media/process/ingest/", then the files themselves, "*.CR2" or
> ".NEF" in your case (this command is case-sensitive).  These embedded jpegs
> are very low res, but look exactly like the default secret sauce end product
> and are perfect for quick review as they load MUCH faster than a raw file. 
> Do the *.nef files have an embedded jpeg?
> 3.  Xnview is a great little image viewer, available both in a linux and
> windows version.  Apparently the windows version under wine works better
> than the linux version (I use xnview under wine).  Xnview can show you the
> embedded jpeg as a thumbnail, and then show you a larger version.  Xnview's
> renditions are very good.  I just checked and Xnview says it reads *.nef
> files.
> 4. If you have a windows CD you can install windows in a VirtualBox - W2K
> actually runs much better for me in a VirtualBox under linux than it ever
> did on "bare metal".  But this is a stop-gap measure, of course, I'm slowly
> weaning myself away from windows altogether.  
> Elle
> -- 
> View this message in context: http://www.nabble.com/16bit-editiing-and-auto-whitebalance-tp16701397p17146376.html
> Sent from the digikam-users mailing list archive at Nabble.com.
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   | Lawrence Plug         Earth Sciences, Dalhousie Univ |    
   |  ljp at dal.ca           t:902.494.1200  f:902.494.6889 |    

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