Posted by Neil Wyatt on 11/08/2015 09:46:02:
Viewing alone is no good, I needed a converter.
.
Neil,
I understand that your problem is solved, but: For the benefit of future visitors to this thread, I will just note that Preview.app in Mac OS X [which I mentioned earlier] does that conversion,and much more, fuss-free.
- open the JP2 file in Preview
- save as JPG
- [there's no need to change filename]
MichaelG.