I got my problem solved, on my side it wasn't a bug. It turned out, my problem was a ppa that made me use a 16bit ImageMagick. In my case it was ppa:dhor/myway which I used because of rawtherapee. Once I removed uninstalled ImageMagick/Octave. removed the ppa and reinstalled octave it worked fine.
A big thank you to Mike, your tip finally made me find what it was. In ages I wouldn't have had that idea.
Hello Paul,
I got my problem solved, on my side it wasn't a bug. It turned out, my problem was a ppa that made me use a 16bit ImageMagick. In my case it was ppa:dhor/myway which I used because of rawtherapee. Once I removed uninstalled ImageMagick/Octave. removed the ppa and reinstalled octave it worked fine.
A big thank you to Mike, your tip finally made me find what it was. In ages I wouldn't have had that idea.
Regards
Alois