The more you do to a LD cap, honestly the worse off the image will be. I did some similar things on some basic LD conversions and the end result looked horrible, especially when scaled to 16x9. I don't really think there's much you can do with filters applied to the source without compromising the image.

From what I've seen of the angrysun LD cap, this transfer is pretty good as far as dirt goes. I was able to watch through it without any real gripes. That white line on the left side at first looks a hair in the gate that was captured in the source transfer. On DVD it will clearly look like a hair, but on LD it gets very digitized and pixelated. Why it's white I don't know, but in the scene where it first appears you can see it fly up into the frame and get stuck there. Later on it shifts slightly in the frame. But then again, it doesn't move all that much so it could be print damage. It does stay for about 11-12 minutes so that could suggest that a reel was somehow damaged.

As for the light source, it doesn't even have to be damage. It can just be the actual filmstrip weaving around in the gate. At school the Steenbeck I had to use wasn't in the best of shape and this would happen to me all the time whenever I ran anything back. It needed some kind of repair or cleaning so the image on the viewer would kinda bounce around to every side while running. Then the corners of the frame would occasionally have flashes of brightness or light-this can mean heads need to be cleaned or wheels replaced or a bunch of other things.

This I'm fine with. The white mark now looks like print damage but I really didn't notice it before. It would be nice to see it fixed, but I don't think there's really a feasible way to do so.