* Volker Lenhardt <volker.lenha...@uni-due.de> [03-09-15 08:08]:
 [...]
> "Selecting 'darktable-1.6.3-99.1.x86_64' from repository 'Tools for 
> viewing and editing photos (openSUSE_13.2)' for installation.
> Resolving package dependencies...
> Force resolution: No
> 
> The following application is going to be installed:
>    Darktable
> 
> The following NEW package is going to be installed:
>    darktable  1.6.3-99.1
> 
> 1 new package to install.
> Overall download size: 2.8 MiB. Already cached: 0 B  After the operation,
> additional 13.0 MiB will be used.
> Continue? [y/n/? shows all options] (y): y
> committing
> Retrieving package darktable-1.6.3-99.1.x86_64 (1/1), 2.8 MiB ( 13.0 MiB 
> unpacked)
> Retrieving: darktable-1.6.3-99.1.x86_64.rpm ........[done (3.8 MiB/s)]
> Checking for file conflicts: .......................[done]
> (1/1) Installing: darktable-1.6.3-99.1 .............[done]
> committingCommitResult  (total 1, done 1, error 0, skipped 0, 
> updateMessages 0)"
> 
> Starting DT showed no peculiarities (starting from terminal showed no 
> errors).
> 
> But when I imported the directory with the photos I worked on last, the 
> same weird behavior returned: some photos were displayed in lighttable, 
> the rest remained solid gray. No editing in darkroom. DT crashed.
> 
> So I removed the sidecar files from the directory. Voilá, everything 
> runs as fine.
> 
> This was no real testing. But at least at the first glance DT behaves as 
> it should.
> 
> Does this mean that I cannot use the old database together with the 
> sidecar files any more? Will I have to retain a copy of DT 1.4.2 in a VM 
> for ever in case I need to make some amendments to older photos?
> 
> Or is there a way to transfer the data? Maybe the whole problem derives 
> from the "sharpen" problem I used to experience with 1.4.2. I described 
> it in my posting from 8 Mar 2015 12:02:41 +0100. I do hope that solving 
> this problem could make DT 1.6.3 work with the old data.

One or more of the developers will have to answer this, but...  I would
guess that something has changed in 1.6.3 reading of the xmp files that
were generated with 1.4.  That should not be a problem for the photos
already in your library as I believe the library contains the xmp data and
can regenerate it for you.

Just for "Peace of Mind" I would gz subject xmp files and the old library
for a period of time.  The library structure changed from 1.4 -> 1.6.x and
is not backward compatable.

I personally prefer darktable from git using the packages created Togan 
Muftuoglu
at http://download.opensuse.org/repositories/home:/toganm:/photography
and have been using them for > year (if memory serves) with very vew
problems.  Note: If you choose this route, keep a backup copy of your
~/.config/darktable/library.db as later versions of darktable introduce
changes to the library that are not backward compatable.

gud luk,
-- 
(paka)Patrick Shanahan       Plainfield, Indiana, USA          @ptilopteri
http://en.opensuse.org    openSUSE Community Member    facebook/ptilopteri
http://wahoo.no-ip.org        Photo Album: http://wahoo.no-ip.org/gallery2
Registered Linux User #207535                    @ http://linuxcounter.net

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