Thanks, I have got a trial of photoshop (I have used corel suite for years!) and found the terraconv app, they seems to be the key to working with the raw 16bit files and i have got a couple into UE4 now. I like to make things interesting so Im wanting to build a tiled world, looking at 16 tiles of 2000m each using a resolution of 1009x1009 , just gotta work out how to set the co-ordinates when i generate now!