[Digikam-users] Exporting/importing tagged face database

[Mateusz Konieczny]

On Tue, 31 May 2016 11:27:47 +0100
Richard Mortimer <richm+digikam at oldelvet.org.uk> wrote:

> On 31/05/2016 10:41, Mateusz Konieczny wrote:
> > Is there an existing tool/setting to export/import data created
> > during face tagging?
> I'm not aware of any existing software that will do this. But...
> 
> > 
> > I am also willing to create software to do this do documentation
> > where and how this data is stored also would be useful (though
> > obviously I prefer to discover that needed software already exists).
> > 
> > I want to create backup of this data. I really would like to
> > tag faces on my photos and Digikam seems to be currently the best
> > available tool but I want to avoid lock-in (especially as face
> > tagging will consume hundreds of hours for my photo collection).
> > 
> > Note that I am not looking for folder with sqlite database file - I
> > want to export this data to some format that will be easily
> > processed.
> I'm not sure what you mean by easily processed. But why do you
> discount the SQLite database? That is a public domain database format
> that is widely supported on just about every computing platform. You
> can use SQL queries to access the data. If you prefer to keep the
> data outside of a database you can dump the data using the sqlite3
> commandline and the .dump command. That will give you a SQL copy of
> the data that you can process/manipulate in your favourite scripting
> language.
> 
> I would not discount the use of a sqlite database. Your data is
> certainly not locked in and the digikam schema/data layout is public
> so if you do ever need to transfer to a different application it
> should be easy to do.

Maybe I was to quick to consider database as dead end. Unfortunately
"Database schema" at https://www.digikam.org/docs links nowhere (to
https://quickgit.kde.org/?p=digikam.git) but at least it means that
database schema is supposed to be documented somewhere...