[Digikam-users] How does digiKam do raw conversions for the slide shows ?

Gilles Caulier caulier.gilles at gmail.com
Wed Dec 23 17:14:29 GMT 2009

2009/12/23 Mark Greenwood <fatgerman at ntlworld.com>:
> On Wednesday 23 Dec 2009 16:59:45 Linuxguy123 wrote:
>> I shot 600 raw images at a wedding this past weekend.
>> I downloaded them into digiKam, tagged ~ 200 of the best and ran them in
>> the digiKam slide show for the gift opening the next day.  They looked
>> awesome.  Everyone was very pleased.
>> Yesterday I tried converting some of the same raw files to jpgs using
>> the tools in digiKam.  They didn't come out nearly as nice, due to
>> issues with white balance settings, exposure, etc.
>> How does digiKam generate the images for the raw files it displays in
>> the slide shows ?   How could I easily generate jpegs that look as good
>> as the images in the slideshow ?
> I would assume that for the slideshow Digikam is using the embedded JPEG data from the RAW file and not the RAW data. You can extract the embedded JPEG using exiftool (though I forget how, try googling it) but that really defeats the object of using RAW. When you use RAW you are expected to do all the white balance etc adjustments yourself. The embedded JPEG has the camera's built-in adjustments already applied. If you're going to use the embedded JPEG you may as well just shoot JPEG in the first place.

Yes, it use JPEG preview. Fast and usefull...

> There's no "easy" way to get good results from RAW, you need to put in the effort to 'develop' each shot yourself. With practice you'll soon be getting *better* results than the images in the slideshow.

and it's long to decode.

> However, all that said, I've found that the tools in Digikam sometimes don't cope very well with RAW files - you need accurate icc colour profiles for your camera, for one thing. Most people seem to like ufraw for RAW processing, and it does seem to give more "accurate" results than Digikam does.

I don't use ICC and i always shot in RAW (minolta). Results are fine
with a some adjustement (saturation). I use auto gamma and 16 bits
color depth of course.

I never use UFRAW : too complicated for me... and GTK (:=)))

Gilles Caulier

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