thanks for the quick response. I found the resolution setting. There is written 1080p, which should be fine. Nevertheless the resolution of the output video looks less than the 360p setting.
Meanwhile i recognized that the problem happens only on the high resolution dslr pictures. If I mix dslr pics with lower resolution pictures from a compact camera, the dslr pictures look very bad, whereas the smaller pictures have the resolution they should have (1080p)
the dslr pictures are taken in raw and imported via camera connector kit. Importing them into Photosmith and exporting them from there to the gallery does not change the problem.