is through either the application or the API.</p>

<p>As well as changing tag values wherever they are found in the image, exiftool
will also create the tag in the preferred group if it didn't exist there before.
By default, the preferred group is the first of the following where the tag is
found: 1) EXIF, 2) IPTC, 3) XMP.  Alternatively, the desired group (in family 0
or 1) can be specified so ExifTool only writes the tag to a single location. For
example, with the command line interface, this is done usin