The most important capability is a way to directly access a small subsection of the complete image. This is generally achieved by tiling, but some formats allow arbitrary access, so that the tiling feature can be implemented.
Another capability is a way of storing multiple sub-resolutions, thus allowing zooming. Some formats have this built-in, others give a way to compute sub-resolutions using special capability of the format.
The last capability is support for very large file sizes, because Very Large Images require large file size.
Here is a sum-up of these capabilities:
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