Version: 4:4.4.5-2

Recently I viewed a large amount of photos on my camera's SD card,
using gwenview. In order to get some ranking, I rated my pictures.
Then I moved my picture files to a local hard disc.

Expected Behaviour:
Rating should be kept with Exif tags.

Observed Behaviour/Problem:
All ratings were lost!

I found no documentation about where gwenview stores ratings.
Maybe I just had to copy or rename some database file, but
no docs for this :/

Thanks
Ralf

According to 
https://forum.kde.org/viewtopic.php?f=154&t=87166
this behavour is due to gwenview storing metadata
to the nepomuk database. Then, it is maybe a lack
of documentation, plus some missing export feature.

Reproducible: Always

Steps to Reproduce:
1. Plug in your cam's SD card
2. Rate your favorite pix
3. Move folder to hard disc.
Actual Results:  
Ratings will be lost

Expected Results:  
Ratings should be kept, internal feature "store changes to exif/jpeg" or the like could be helpfull...

ref. https://forum.kde.org/viewtopic.php?f=154&t=87166
One of the last comments there quote a script to ex/import tags from/to nepomuk to/from files.