@FrankT - a long time. Long time. :) Also, you'd get practically nothing from an 8k scan over a 4k. The grain dots are already the size of nail heads - there's just nothing else in there. There are also great whitepapers from various sources (check DFT-Film, especially) on why 4k is kind of "it" from most sources.

@Neverar - because a LOT of noise reduction/degraining was used in the Lowry restoration. I'll do a video showing the tell-tale signs, maybe recreating it so you can see what happens. Anyway, one of the byproducts of that is it averages out all the grain in the image, so they put some back, but for more than just aesthetic reasons:

When you degrain an image and do noise reduction, it tends to look very soft - smooth, but soft. When you add grain back - it's the wildest thing - it suddenly looks sharp again. It's like your brain has something sharp to focus on, so it just rethinks the image. I'll show this in action too, before/after. It'll blow your mind how adding grain suddenly makes a soft image seem sharper.

_Mike