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TIFF Tag Reference, Interoperability Tags
The single Interoperability tag is used to encode compability information, related to image generation by digital still cameras.
The Interoperability IFD is pointed to by the Interoperability IFD tag.
There are actually three private IFDs specified by the same Exif standard that also specifies Interoperability. The other two are the Exif IFD and the GPS IFD. For the Exif specification and other related information, see Exif.org.