The real limiting factor on the whole exercise was actually nothing to do with render power or even the compositing. It was more that the fact the images occupied so much space on disk that it was difficult to install enough servers into the building to be able to hold all the data. A single frame of IMAX, at 8.4K full resolution is 200 MB of data, whereas a standard 2K frame is 10 MB of data, so it’s 20 times the size of a standard frame. That totals to roughly 100 terabytes of storage.
— FX Supervisor Paul Franklin on filming The Dark Knight in IMAX
