Antialias effect intensity

[Hackerman]

I am talking about a huge 10000×7913 artwork poster image with no antialiasing at all. It doesn't have any transparency. As I need to apply gaussian blur in selections using the fuzzy tool, having aa before would put me in a lot of effort (having to zoom closely to make sure the correct pixels are in the selection). And 1 pixel is not enough for it too look good in 100% scale. If I import it with maximum aa (more than 1 pixel) it looks great. But it is the fuzzy tool that works much better without aa. Because of its size and nature (eps) more aa doesn't make its quality worse. It looks really bad with 1 px aa.