[Digikam-users] Exporting/importing tagged face database

[Gilles Caulier]

yes, in source code, there is a project sub dir with LibreOffice
spreadsheet with DB schema.

For obscure reason, the dir where document are hosted cannot be accessed
through git web interface.

But DB do not use exif info has schema. Look in Exiv2 shared library
document to see where face tags are stored in XMP. Exif is not dedicated
for that.

Also we follow MWG to store face tags region :
http://www.metadataworkinggroup.org/pdf/mwg_guidance.pdf

Gilles Caulier

2016-06-01 19:33 GMT+02:00 Mateusz Konieczny <matkoniecz at gmail.com>:

> 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...
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