[PepeGomez]

>This is plain wrong. As others have pointed out, it is independent of the scaling method - it just looks for similar patches (at different sizes, mirror images, and perhaps even rotations - I don't remember) on the same image to find the best one that matches, and uses that for information.

Which is much harder to do when the scaling method isn't known.

[beagle3]

It doesn't even have to be scaling. It will work just as well copying only from similar images (e.g., if this was a frame from a movie, they could use nearby frames to the same effect; or if it's a picture taken of the same thing from a different angle).