Pat, in post #135 Diego gives an explanation on how to do this.
http://gimpchat.com/viewtopic.php?f=10& ... &start=130
I've tried but couldn't quite understand it.
I think because of my lack of knowledge about all the specific technical details about photos.
I've done it my own way now. A very cumbersome procedure.
It is difficult for me to explain exactly how I did it. I can't write a tutorial about it.
It was mainly trial and error.
You wouldn't want to know how much time I spent on these two ...