[Digikam-users] Non-RAW NEF support

Photonoxx photonoxx at free.fr
Sat Dec 26 09:28:44 GMT 2009

With the thread about embed JPEG in RAW files, I test the command line to  
see property of Embed files in this kind of file :

For one created from a TIFF (this TIFF was created from a JPG, but I don't  
think it's changing something), the exiv2 -pp myfile.nef give this :

Preview 1: image/tiff, 320x212 pixels, 203520 octets
Preview 2: image/jpeg, 2048x1360 pixels, 1650457 octets
Preview 3: image/jpeg, 2048x1360 pixels, 1186804 octets

I extract the preview in files and determine which one corresponds to  
thumbnail (preview 1 but it's not so hard find), to full preview of  
modified version (preview 2), Embed original file (preview 3 apparently,  
but at this step, I find ugly to JPEG compress on more time originally  
TIFF file... but it's a CaptureNX matter ! :) )

I just test with the JPEG embed in RAW I provide here and it's the same  

So I don't know if Digkam can recognize this kind of nef file, but, if it  
can, it would be great to use the preview 2 to view the file when we click  
on this kind of pictures.

But it seems it's already what Digikam does for classic Raw files modified  
by captureNX wich only have thumbnail (preview 1) and jpeg preview at full  
resolution (preview 2)

For NEF files out of the "box" (camera) it's different, there's three  
embed files one smaller tiff thumbnail (preview 1 - 160x120 instead of  
320x214), one very medium jpeg preview (preview 2 - 570x375) probably use  
to display on the camera screen and a full size jpeg preview (preview 3).

So I don't know what it could be do.



Le Wed, 23 Dec 2009 16:28:25 +0100, Photonoxx <photonoxx at free.fr> a écrit:

> Hi, I don't know if it can be made in Digikam or it's depend of other
> component but I would like to suggest to take in charge a special kind of
> NEF files.
> In fact, NEF files are most of the time RAW files out of the camera embed
> in a NEF container, including parameters used to develop the RAW data.  
> But
> with CaptureNX, you can edit the NEF files to modify and create different
> version of treatment for a files and save all this modification embed in  
> a
> NEF files, without alter the RAW data.
> In the same kind of spirit, CaptureNX permit to open JPEG or TIFF files,
> modify them and save them embedding original file + modication in a  
> single
> NEF file. In this way, for example, there is no more deterioration of  
> files due to multiple saving with a destructive format.
> But, with digikam, if I can see thumbnail for this kind of picture,
> Digikam seems to be unable to show the prewiew of this image nor load it
> in editor, so I ask me if support of this kind of NEF files could appear
> in future realease of digikam.
> You can find a sample JPEG embed in NEF file here :
> http://photonoxx.free.fr/digikamNX2/nb-photos-20060528-131503.nef
> I notice, the thumbnail viewed in Digikam correspond to the modified
> version, but in nautilus (i'm under Ubuntu 9.10), the thumbnail seems
> corresponding to the original shot, but nor Fspot viewer, nor Gnome Image
> Viewer, nor Gimp can open this original file, instead they open the
> modified version thumbnail (approx. 320x200) and may be Fspot viewer
> display a bigger version of the modified result but not the embed JPEG.
> I hope I was not to confuse, and thanks if you find a way to support a
> little more this kind of file (I don't think about editing, but at least
> display the bigger preview data).
> Thanks Nicolas

Nicolas Boulesteix - Chasseur de lueurs - http://www.photonoxx.fr

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