Lists all EXIF MakerNote types.

Values:

IG_MAKERNOTE_TYPE_UNKNOWN	Unknown. This is the default type. This type means that ImageGear can't detect Makernote as any other type. Preserving such a makernote and saving it with the file, most likely, does not make any sense, because IFD offsets will be corrupted.
IG_MAKERNOTE_TYPE_IFD	TIFF IFD. Makernote is a valid TIF IFD.
IG_MAKERNOTE_TYPE_IFD_PREFIXED	Prefixed TIFF IFD. Same as IFD, but with a short prefix before the IFD. The prefix is also preserved, so the whole Makernote is preserved when writing to a file.
IG_MAKERNOTE_TYPE_TIF_HEADER_PREFIXED	Makernote starts with a prefix, then goes TIF image header, which points to an IFD.
IG_MAKERNOTE_TYPE_IFD_PREFIXED_OFFSET_II	Makernote starts with a prefix, then goes offset to the IFD, then IFD itself. Makernote IFD uses Intel byte ordering (II), even though the whole file uses Motorola ordering.
IG_MAKERNOTE_TYPES_MAX	Specifies the number of supported makernote types.