Hi Phil & all,

I've come across some odd behaviour using exiftool to backup all the metadata in my images to MIE files. If I take an image from an Olympus C-3030Z (just happened to be the first one I found) and do this:

There are a couple of unexpected differences in the output file (I'm diffing the output of "exiftool -a -G1 -s" to see what changed).

- The YCbCrPositioning tag has changed from "Co-Sited" in the JPG file to "Centered" in the MIE.
- The InteropIFD group isn't copied at all.

If I copy the MIE data back into the original JPG, YCbCrPositioning doesn't change (it stays correctly set to "Co-Sited"), but if I copy the MIE into a JPG with all the metadata stripped out, it does end up with YCbCrPositioning = "Centered".

I don't know if this is expected or not, or if it happens with any other tags, or if there's a more sensible way to back up all the metadata from an image.

This is all with exiftool 6.76 - apologies if this has changed in a later version, but I couldn't see anything relevant in the change log.

The files mentioned above are here.

Cheers,

Scott