Only unknown tags can be accessed by number, but unknown
tags are not
writable anyway. I suggest using EXIF:ImageUniqueID if you
want to store
a unique identifier in the image, but this tag should be
formatted as a
string of 32 hexadecimal digits, so it may not be exactly
what you are
looking for. There is also an EXIF:ImageNumber tag, but it
is not currently
writable because it is not commonly used.<br /><br
/>
- Phil
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