You saw the whole image only if you watched Avatar in an IMAX theater, and projected correctly by not filling the whole IMAX screen. The aspect ratio of Avatar in IMAX, is 1.78:1. You get to see more image at the top and bottom, compared to all other cinemas showing Avatar which have an aspect ratio of 2.35:1 and is only an extract of the original picture.
So if you watched Avatar in RealD)) 3D, Dolby 3D, Master Image 3D, XpanD 3D, or 2D, then you are missing part of the picture.
There is one exception to the above, and that is a small number of cinemas have a fixed width screen. These cinemas are showing 3D Avatar with a 1.78:1 aspect ratio, the same as IMAX.
Here is the breakdown if you are confused:
1.78 : 1 (2K 3-D version, constant image width venues)
1.78 : 1 (IMAX 3-D version)
2.35 : 1 (2-D version)
2.35 : 1 (2K 3-D Version, constant image height venues)
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