Hi Giulio. I can't do that for copyright and privacy reasons, but in any case I believe I understand the issue. The region in fact has to be an image, graphic or matrix equal in dimensions to the image being inpainted i.e. to say I have to provide a mask?
Unfortunately it turns out I don't have enough computer memory to process the image (it's a very large file), but I do believe I understand what I have to do - use ReplacePixelVlue to create an appropriate mask for the crease. I'll experiment with a reduced file and come back if I'm still in difficulty.
Thank you for your reply.
Ed.