Tool will even do some simple
matching so that you could even just set it to "day", and ExifTool will search
through the valid values and will choose the one that contains the string "day".
If the value is ambiguous, the tag will not be set.  If no tags can be set with
the specified value, ExifTool returns an error message.</p>

<p>The tag values can also be specified at a numerical level by disabling the
print conversions that are normally applied.  This can be done on a tag-by-tag
basis or on a global bas