[digiKam-users] Synchronizing metadata?

[daj omu]

Hi,

I tried to use DK with a remote server (LAN) and storing the thumbnails
locally, but for me it was too slow so I went back to keep all DB´s
locally. So unless you are using a cabled network remote server is not a
good solution in my opinion.
In addition to storing the photos on a NAS I backup to Google Photos (GP).
Being clever I tried to store the faces into the image metadata so that any
computer could recognize the faces. If it hadn´t been for GP reading the
changed photos as new photos that would have worked fine I guess. When GP
saw the "new" photos, Google Drive started to back them up again and
created a lot of duplicates in GP. Photos that were taken in 2005 suddenly
appeared with today's date. Luckily all of them had the same modified date
so I was able to delete them all quite easily.
If GP could read "date taken" instead of "modified date" I would probably
have chosen to store faces in the metadata.

dajomu

On Thu, Feb 3, 2022 at 2:56 PM Henrik Hemrin <hehemrin at hemrin.com> wrote:

> Hi,
>
> Not the answer but factual background, taken from The digiKam Handbook,
> page 30:
>
> "Everyone knows about database, it is used to store data. As all other
> photographs management programs, digiKam too uses the database for some
> obvious reasons like avoiding data duplica- tion, reducing data redundancy,
> a quick search engine, and greater data integrity. Moreover, the cost of
> data entry, storage and retrieval are drastically reduced.
> Additionally, any user can access the data using query language.
>
> Talking in particular about digiKam, the Albums, Album Roots, Tags,
> Thumbnails, Face Recog- nition Data, Image Metadata, File Paths, Settings
> etc. are all stored in different database files.
>
> The digiKam actually manages more than one databases. For convenience, it
> is broadly categorized in three:
>
> • Core database for all collection properties, i.e. it hosts all albums,
> images and searches data.
>
> • Thumbnails database for compressed thumbnails i.e. to host image thumbs
> using wavelets compression images (PGF format).
>
> • Face database for storing face recognition metadata i.e. to host face
> histograms for faces recognition.”
>
> Regards
> Henrik
>
>
>
> 3 feb. 2022 kl. 14:09 skrev George Koulomzin <george at koulomzin.com>:
>
> Thanks for your reply!
>
> The XMP solution would avoid issues with invalid paths  that I suspect
> would be a problem if one were to try to copy the actual DB, so it is
> attractive.
>
> I've also been reading up on the "remote server" approach.  I would be the
> best solution if performance is acceptable.  Does anyone have any
> experience with this?
>
> It is not clear to me where the "training" information is kept, i.e. the
> set of parameters which help the algorithm decide this picture shows John
> rather than Joseph.  Clearly, sidecars would not be the place.  How would
> one synchronize *that* information?
>
> My environment is:
>
>    - Windows 10 OS all around.
>    - WiFi everywhere, with cat 6 cable to some locations
>    - 90,000+ image files, with a lot of "duplication" -- I keep both
>    jpg's and raw files.
>
> Thanks in advance...
>
>
> On 2/2/2022 7:27 AM, Henrik Hemrin wrote:
>
> George,
>
> On the second question, I would use the XMP sidecar as the key for
> solution. You set up so DK writes metadata to XMP side car, you bring the
> latest side car with you between your computers and ask DK data base to
> read the latest XMP side car file after you have updated it/brought to the
> other computer. This method of course means you cannot update the same
> photo on both machines at the same time.
>
> Someone else may elaborate more in detail, but one general level, I
> believe this can be a simple solution.
>
> I am sure it is possible make a more advanced setup, I guess that kind of
> effort depends on how many photos, how often etc, if a more automatic
> proper sync is better. But again, someone else may have that answer.
>
> Best regards
> Henrik Hemrin
>
> 1 feb. 2022 kl. 14:25 skrev George Koulomzin <george at koulomzin.com>:
>
> Hello, I a new to the list, so please forgive me if these questions have
> been answered.
>
>    - the archive is organized by month.  Is there a way of seeing thread
>    topics by year, or longer?
>    - how can one synchronize tag metadata (e.g. faces) across two
>    computers.  I have a desktop pc with ALL my photos and a laptop with SOME
>    of my photos (laptop is always a subset).  I've done face recognition on
>    the laptop (subset); can I port the resulting metadata back to the pc so as
>    not to have to repeat all the training?
>
> Thanks in advance!
>
> --
> George Koulomzin
> 7 Bridge Hill Lane,
> PO Box 781
> Bridgehampton, NY, 11932
> (h) 631-537-4956
> (c) 914-393-6179
>
>
> --
> George Koulomzin
> 7 Bridge Hill Lane,
> PO Box 781
> Bridgehampton, NY, 11932
> (h) 631-537-4956
> (c) 914-393-6179
>
>
>
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