Tags and JPEGS - reload wrong tags - suggestions?

[digikam at boeziek.nl]

I have indeed selected the option to be compatible with commercial programs. However, the RAW and JPG names are not identical as I continue numbering.
So PHOTO1.RAW, PHOTO2.JPG, PHOTO3.RAW and each with an accompanying .XMP file,
as in PHOTO1.XMP, PHOTO2.XMP, PHOTO3.XMP.

If the image files had the same name, like PHOTO1.RAW and PHOTO1.JPG then the PHOTO1.XMP would always be correct as it is written when adjusting the RAW file.

So somehow, you want either to ignore .XMP file when there is no RAW file with the same name or a better way I think would be to force to write to an existing .XMP file when you update a .JPG file.

Thank you,
Etienne


On 17 May 2024, at 12:37, Maik Qualmann <metzpinguin at gmail.com> wrote:

The problem is that in order to read LR sidecar you have probably activated 
the digiKam option for "compatible sidecar filenames for commercial programs" 
to read sidecar in BASENAME.xmp format.
In this mode, the sidecars apply to both RAW and JPG files together. Which is 
bad. Therefore we also prefer BASENAME.EXT.xmp. In this case with BASENAME.xmp 
we need another option to only write/read to RAW files. I'm sure we already 
have a bug report about this.

Maik

Am Freitag, 17. Mai 2024, 10:41:36 MESZ schrieb digikam at boeziek.nl:
Hello,

I came from Lightroom and CaptureOne to Digikam.
In the past I thought I was being “smart” by saving XMP files for JPG files
in CaptureOne (perhaps even LR). Now I learned that is not the most
compatible way to operate. I understand that XMPs are for RAW files and the
metadata for JPG should be written into the JPG file itself.

During adding my C1/Lightroom photos Digikam reads the JPG XMPs, correct?

Currently, I noticed that when I change the Tags in Digikam, it gets written
to the JPG itself. The XMP for JPG is ignored and then Digikam seems to
read metadata from both files again. At least that is my analysis so far as
RAW files seem to be processed correctly when changed. In this case I get
the new tags, but the old tags are re-read everytime again for JPGs.

In Digikam I turned OFF changing the modification date (under
Metadata->Behaviour), and for Sidecars I have set them to write to read
only items (thus RAW). This makes sense as I shouldn’t have XMP files for
JPGs eventually. And is likely part of my problem. As I don’t have XMPs for
ALL JPG’s, changing the setting to write only to XMP leads to even more XMP
files and less future compatibility I think, correct?

Any ideas how to fix this editing of Tags?

The only solution I see is to remove XMP files belonging to the JPG files,
but these are probably 50,000+ files.

Thank you for any suggestions,
Etienne