That is an interesting question you've brought up. Normally, a movie is cropped from a wider image to a narrower one but with IMAX it is the other way around.
Aspect ratio is the ratio of width to height. A perfect square would be 1:1. Your standard HDTV is 16:9, or if you divide 16 by 9 you get 1.78 so the actual aspect ratio is 1.78:1. Basically, an HDTV picture is almost twice as wide as it is tall.
IMAX film has an aspect ratio of 1.44:1, slightly wider than the old TV ratio of 1.33:1. Most epic movies are 2.40:1, so an IMAX filmed image would have to be cropped by roughly 42% to fit the 2.40:1 frame. In the case of the Dark Knight, the cinematographer would make sure that the area that would be shown in a standard theater (i.e. 2.40:1 widescreen) would be framed nicely and not lose any parts of the image that are important to the story. This is called a protected zone, as you are shooting an image with the knowledge that parts of it will be cropped out.
The answer to your question is no. Interstellar is coming out in IMAX 70mm today, and it has a mix of 2.40:1 35mm material and 70mm IMAX. The entire screen will be used for the IMAX footage, but the rest of the movie will be letterboxed so none of the image is cropped off.
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