Quote:
Originally Posted by
Nicholas Martin 
Christopher Nolan wanted to preserve the effect of the more immersive IMAX presentation of his film and knew the only way to do so was to reformat the IMAX footage to a full 16:9 ratio.
This annoyed people with specific displays, wanting just a straight 2.35 presentation because the shifting would mess with their setups (so what do they do when watching 1.85 or 1.78 movies? Avoid them all? How does that work?) Others were worried about the shifting being a potential distraction. Fair enough. Understandable. A few said it was the wrong AR regardless of what Nolan decided. It's his movie, and he knew he had to make a subtle compromise.
The people in question are using "constant height" displays, which have an aspect ratio of 2.39:1, so that all movies completely fill the height of the display, but may not completely fill the width, depending on the aspect ratio of the movie. So, watching a 1.78:1 movie is no problem. It fills the screen in one dimension (height) but not the other (width), just as with any film whose aspect ratio is different than that of the display on which it's watched.
The problem with
The Dark Knight is that while the bulk of the film is 2.39:1, a few select scenes are 1.78:1. These scenese are "opened up," changing the height but not the width of the image. This works great on a 1.78:1 display, but not for a 2.39:1 one. Watching
The Dark Knight on such a display would mean either having a large black border around all four sides of the image during the 2.39:1 scenes, or filling the screen with those scenes but cropping the 1.78:1 scenes.
A completely 2.39:1 version of the film was created for traditional (non-Imax) theaters, and would have been the perfect version of the movie to watch for viewers with a constant-height display. Sadly, Warner chose to omit that version from the Blu-ray. Inexplicably, it
was included on the DVD, which is certainly not the medium on which constant-height display users would be watching the film.