Thanks to Adrian, the openSUSE Build Service has now pre-build binaries for the HDR tool qtpfsgui. The packages can be downloaded and installed with 1-Click install directly from the Build Service.
I went out tonight and took some photos in Fürth - and then played around with qtpfsgui:
Grüner Markt, Fürth.
Using a different toning algorithm, the same photo can look quite different, far more like a painting.
I do like both of them - and guess I'll have some fun in the next weeks exploring qtpfsgui.