Gets internal information from the image.
Internal information is format specific so you need to use
different selectors with different formats.
The JPEG 2000 format implements a "Structure" info which
provides the tag structure of the raw data together with types,
offsets and lengths. This can be used to modify or insert tags for
custom output.
The TIFF format implements a "TiffTag:" info which allows you to
get the values of TIFF tags either by name or number. Simply append
the item you are interested in. For example you might use
"TiffTag:InkNames" to get the ink or "TiffTag:271" to retrieve the
scanner manufacturer.
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