That's right, all the comments about the Bluray having the most detail is correct.
No amount of interpolating or using multiple sources will put the detail back into it, despite the claims made.
On the other hand, for most cases the 1080p versions don't have more detail than the 720p on the Bluray as Harmy has shown.
We're never going to have that kind of detail from scans of prints.
Team Negative1