Sorry, when I said "after writing other values", I meant in a separate command. Currently, exiftool has the following limitations:

1) -tagsfromfile @ tags are set after all other tags on the command line. (Note this is not the case for -tagsfromfile FILE.)

2) Copying a tag with -tagsfromfile clears any existing new values that you are writing.

So there are 2 ways around this:

A) Copy the tags into an existing list in a separate command using "+<".

B) Specify a filename for -tagsFromFile and copy the -tagsfromfile tags before writing other tags on the command line. Then the list will still be reset when you copy the tags, but you can add the fixed-value items afterward.

I hope this makes sense.

I am working on an idea of implementing a -addTagsFromFile option to allow tags to be copied without overwriting existing new values.

This whole topic is a bit confusing for some, because of the difference between overwriting existing new values and overwriting existing original values in the file. You haven't fallen prey to this confusion, but I'm sure that others will if I add a -addTagsFromFile option so I am trying to work out how to best deal with this. Any suggestions are welcome.

- Phil