Messy tags

[Ozy Mate]

Additional information:

I noticed that all the unnecessary tags coming after a sync from 
metadata to database are for DNG files. There is no problem with the jpg 
etc. files.

I tried tag writing to DNG on another digiKam installation with small 
sets of DNG pictures. Yes, I can confirm that digiKam cannot write to 
DNG files. Maybe there is a setting somewhere, I don't know.

Now, my question is how to write/modify/delete tags from metadata of DNG 
files, if possible.

Thanks.

On 8.12.2023 10:21, Ozy Mate wrote:
> I have been using digiKam for years. Thank you for such a capable 
> software. I have 8.1.0 at the moment.
>
> Recently, I wanted to re-organize the tags and unify the database and 
> metadata (in files) the same.
>
> This is what I did:
>
> 1. Synchronize tags from pictures metadata to database.
> 2. Corrected all the tags, deleted some unnecessary tags within 
> Digikam (hence database).;
> 3. Synchronize tags from database to metadata.
>
> So far so good.
>
> But, just to check the result, I re-synced from metadata to database. 
> I see that many of the tags in metadata came back to tag list.
>
> So it seems that synchronizing from database to metadata just copies 
> tags from database to metadata. It doesn't delete existing tags in 
> metadata.
>
> By the way, I had used Lightroom before digiKam. I see some references 
> to Lightroom in metadata. Perhaps that is the reason. Not sure.
>
> So, my question is how to get rid of existing tags in metadata so that 
> I can cleanly sync from database to metadata.
>
> Thanks.
>