After spending hours at this, I still can’t figure out how to feather/soft edge a couple of photos so I that I could lay them side by side, and overlapping a little.
Seems really easy with Illustrator, but couldn’t figure out the way to do this in Intaglio!
Overlap the pictures, select them and go to Window>Effects. In the Effects dialogue box, click the Plus icon and select Standard>Exterior Glow. Either picture can be moved independently and the all-round soft shadow moves with it.
The shadow on the frontmost picture overlaps the lower picture. If that’s a problem, group both objects before adding the Exterior Glow effect.