[digiKam-users] Keyword (metadata) consistency between programs

[Alan H]

I was thinking that given the configuration option “use a compatible file name for writing sidecar files”, and digiKam creating files using the extensions (.on1 & .xmp) that ON1 uses, that the sidecars would be interchangeable. The internal structure of the files even appears to be similar between what digiKam creates and ON1 creates (to an end-user, perhaps not a developer/programmer).

Unfortunately it seems that contradictory metadata is written. As you may see in the Dropbox files jpeg metadata is overwritten by raw metadata in what are suppose to be jpeg blocks. Or, metadata is not updated without applying a very unintuitive process. Raw photo metadata can therefore be embedded in jpeg photos.

Perhaps there could be more detailed explanation by digiKam what was meant by “Use a compatible file name….” since the way I thought it worked does not appear to be correct, or I’m not using it correctly. Or maybe ON1 has advanced the structure of their sidecar files beyond what digiKam has programmed.

Any insight appreciated. Thanks.



Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10

From: Alan H<mailto:webaccounts at live.com>
Sent: Tuesday, April 28, 2020 1:59 PM
To: digiKam - Home Manage your photographs as a professional with the power of open source<mailto:digikam-users at kde.org>
Subject: Re: [digiKam-users] Keyword (metadata) consistency between programs

I’ll create a Dropbox link with 3 sets of files and some explanation and send the link via your email.

Thanks

Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10

From: woenx<mailto:marcpalaus at hotmail.com>
Sent: Tuesday, April 28, 2020 12:43 PM
To: digikam-users at kde.org<mailto:digikam-users at kde.org>
Subject: Re: [digiKam-users] Keyword (metadata) consistency between programs

Ok, this is a bit complex, so I am not sure if I'll miss something.

Basically you want to be able to interoperate between ON1 photo editor, and
Digikam, and only using sidecar files.

As far as I know, .on1 sidecars are exclusive to the ON1 photo editor, so I
don't think Digikam is able to read or produce them. Apparently, .on1 files
not only include metadata (like keywords and dates) but also information
about the editions done on the photo. So if you edit some keywords in
digikam, store them in a .xmp, and then ON1 reads only from the .on1 file,
it won't see any changes.

I am not sure about the correct blocks that jpg and RAW photos should or
should not. I know that digikam uses a bunch of redundant keyword tags in
order to be compatible with lots of other picture managers, and usually that
shouldn't be a problem, so I wouldn't be worried if you see a JPG and RW2
tag block (as long as there isn't contradictory information).

Moreover, the information of the XMP sidecar can also be embedded in the JPG
picture itself (but not the RAW, usually), so digikam and other softwares
can read that information without the need of a xmp sidecar. If there is
contradictory information between both, I am not sure to which one Digikam
will give priority.

Can you attach us an example of a picture and its sidecars (.xmp and .on1)
so I can see and try for myself?



--
Sent from: http://digikam.1695700.n4.nabble.com/digikam-users-f1735189.html


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.kde.org/pipermail/digikam-users/attachments/20200428/23391207/attachment-0001.html>