[digiKam] -- extracting jpegs from RAW

Gilles Caulier caulier.gilles at gmail.com
Tue Feb 20 18:30:14 GMT 2018

digiKam can process RAW file in batch using JPEG preview image embedded in
RAW. Look in Batch Queue Manager queue settings. It's very easy to use.

Gilles Caulier

2018-02-20 19:18 GMT+01:00 Remco Viëtor <remco.vietor at wanadoo.fr>:

> On mardi 20 février 2018 18:22:32 CET Tac Tacelosky wrote:
> > I'm a bit confused about something, and hoping someone can help.
> >
> > I read that saving RAW+Fine in the camera was a waste of space, because
> the
> > JPEG image is stored as a preview in the RAW file itself.
> A jpeg preview is usually stored in the Raw, but at a much smaller size,
> like
> 1/4 of the full size. Those jpegs are rendered with the same settings as
> for a
> camera-generated full jpeg apart from the demosaicing, so they should look
> identical on screen.
> > But I also read that the JPEG rendering in my Fuji x100 is quite good,
> and
> > is often better than "Save as JPEG" image I get when simply adding RAW
> > images to a queue as saving them as JPEGs in another folder.
> >
> > So I'm either doing something wrong, or misunderstanding something.
> >
> > I don't care much about the disk space, but it's a bit of a pain to have
> 2
> > images, displayed identically (the jpeg and the embedded jpeg preview)
> when
> > using digiKam to rate my images after import, when I'm trying to decide
> > what should happen next for each one.
> >
> > And certainly I don't want to archive both the raw and jpeg if the jpeg
> is
> > indeed embedded in the file.
>  see above.
> > So the question is, can I extract the camera-rendered JPEG using DigiKam,
> > and would it be any different than storing the RAW+Fine or Raw+Normal?
> Or
> > does digiKam render it's own JPEG file from the raw, based on the camera
> > settings (e..g while balance, constrast).
> As explained above, the difference between the embedded and the separate
> camera
> jpegs is the size/resolution.
> Digikam only renders a jpeg when you ask it to, using the editor. And in
> practice it's very difficult to get output from a given raw file  that's
> identical to the corresponding camera jpeg.
> > Should I be saving RAW+(Fine|Normal), or is that duplicating data I can
> > easily get.
> If you mean "should I be saving Raw + fine to get the proper preview in
> Digikam", the answer is "no", if you want to have a full format jpeg
> without
> doing the editing yourself, the answer is yes (but if you don't want to
> edit
> the raws yourself, why do you shoot Raw as well?).
> Remco
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