[Digikam-users] (no subject)

[botta at pik-potsdam.de]

Gilles,

I have meanwhile tested 1.2.0 (Debian stable), 1.9.0 (Debian testing)
and 2.5.0 (Windows in Virtualbox).

The behavior is exactly the same: previews (half sized or via embedded
JPGs) look as if auto-brightness was always active. Unfortunately there
seems to be no way for users to setup how images are displayed in
previews.

In practice, previews are often significantly brighter/darker than the
images that one obtains by opening the image editor (with auto
brightness switched off) and significantly brighter/darker than the
images shown in thumbnails.

For completeness, I have also tried Lightroom 4 (again, under Windows in
Virtualbox). In LR4, previews of DNG files are consistent with views of
the correspondent JPG files and with the thumbnail views.

Although I find the UI of Digikam nicer that that of LR4 (which I do not
have really learned, so far) I think that the problem I have reported is
serious and prevents many users to make Digikam their first choice. 

In fact, because the preview of DNG files sucks, users are de facto
forced to save both DNGs and JPGs on SD or, alternatively, to save only
DNGs and open the image editor every time they need to inspect a
picture.

best,
Nicola




Gilles Caulier <caulier.gilles at gmail.com> wrote:

> You must to try with last digiKam 2.5.0 and kipi-plugins 2.5.0. DNG
> converter is a kipi plugin.
> 
> Gilles Caulier
> 
> 2012/5/2 Nicola Botta <nicola at pik-potsdam.de>:
> > With
> >
> > Qt: 4.6.3
> > KDE Development Platform: 4.4.5 (KDE 4.4.5)
> > digiKam: 1.2.0
> >
> > and, more recently
> >
> > Qt: 4.7.4
> > KDE Development Platform: 4.7.4 (4.7.4)
> > digiKam: 1.9.0
> >
> > I have consistently experienced the same problem when working with DNGs
> > and JPGs generated by Ricoh GXR modules:
> >
> > For a given picture, the thumbnail views of both the DNG and of the JPG
> > files are fine. Import (RAW decoding) of the DNG file is fine too with
> > Auto-Brightness unchecked. The JPG preview is also fine but the DNG
> > preview often looks horrible.
> >
> > No matter whether "Embedded preview loads full-sized images" is checked
> > or unchecked, DNG previews often look quite different from their JPG
> > counterparts *AND* from from their raw decoding imports.
> >
> > In many cases, DNG previews look like raw decodings with Auto-Brightness
> > checked. It is as if brightness always was auto-adjusted in DNG
> > previewing.
> >
> > This is quite frustrating since it makes DNGs unusable for previewing
> > and forces me to save both DNGs and JPGs versions of the same picture.
> >
> > Any idea how to solve this problem ? Any help is highly
> > appreciated. Best, Nicola
> > _______________________________________________
> > Digikam-users mailing list
> > Digikam-users at kde.org
> > https://mail.kde.org/mailman/listinfo/digikam-users