I tried that but I couldn't get enough fringing that way sadly, would have been easier.
I have hit another snag though, if I create a duplicate layer I can't move the channels in that (but can in the background layer) I can work around it by creating a duplicate image and editing that with the effect, but I'd prefere to add the effect on a duplicate layer if possible. Any ideas on moving the channels in a duplicate layer?
Thanks for the replies.
Wayne