fun getActualTagCount(tagId: int, ifdId: int): int
Gets the number of elements for an ExifTag in a given IFD.
tagId - int: a defined tag constant, e.g. {@see #ExifTagKey.IMAGE_WIDTH}.
ifdId - int: the IFD containing the ExifTag to check.
Return
int: the number of elements in the ExifTag, if the tag's size is undefined this will return the actual number of elements that is in the ExifTag's value.