*processed using gimp.
I found a picture of a really old book with this kind of damage on the cover. I did a “select by colour” of the damaged area. Copying that over to my image I then used the selection to extract from my image. It was a bit too neat so I then reused the same selection, grew it by 10 pixels, filled it with white, blurred it a lot and used that as what you see as the white glow around the worn spots. This makes it look more like natural damage.