Originally Posted by Theophile:
“Is 1080i interwoven and 1080p progressive?”
Interlaced and progressive.
It's quite a confusing area, but - I think - whether you'll see much of a difference between the original BDs and the new ones in the new boxed set comes down to the frame rate it was originally shot in.
True, full 1080p, implies a frame rate of 50fps (60fps in NTSC-land). Each frame comprised of 1080*1920 pixels.
1080i, on the other hand, captures only half the vertical resolution in each frame. Alternate frames have lines 1, 3, 5, 7, 9 etc. and 2, 4, 6, 8, 10 etc.
In both cases the TV displays at 50fps. In the case of 1080i, the TV assembles the full resolution frame from each half and displays it twice.
1080i is a
bit like the way film was always shot at 24fps, but when projected, each frame was shown twice, resulting in 48fps, fast enough to fool the eye's persistence of vision.