https://bugs.kde.org/show_bug.cgi?id=439206

--- Comment #7 from kfut10y...@protonmail.com ---
Decided to test again on another machine with a fresh install of Linux with no
modifications beyond what is listed below (including not enabling “add
information to files” during install). It appears I missed a critical step in
the original instructions: tagging the face. Steps are as follows:
1. Install Kubuntu 21.04 on an x86-64 machine
2. Install digikam (7.1.0) via Discover or apt in default config
3. Enable “Write to XMP sidecar for read-only item only” in Metadata->Sidecars
4. Enable “Read from sidecar files” in Metadata→Sidecars
5. Enable “Image Tags” in Metadata→Behavior→Write This Information to the
Metadata
6. Download
https://img.photographyblog.com/reviews/fujifilm_x_t3/photos/fujifilm_x_t3_86.raf
7. Scan collection for faces - Detect faces /  manually select face area
8. Scan collection for faces - Recognize faces / manually enter name tag
9. Accept face match / apply a tag
10. View the thumbnail of the newly tagged image

Interestingly, disabling “Update file modification timestamp when files are
modified” in Metadata→Behavior→Reading and Writing Metadata seems to also stop
the bug from appearing with new files, but does not fix previously tagged
files.


(In reply to Maik Qualmann from comment #6)
> How you automatically found faces in the first two sample examples is a
> mystery to me. Neither with YoloV3 nor with changed sensitivity settings, I
> can find the faces here. And yes, my digiKam is still okay.

The bug is reproducible with manual face tags (was going to use the following
image for #1 originally and just manually tag a square:
https://raw.pixls.us/getfile.php/865/nice/Fujifilm%20-%20X-T2%20-%2014bit%20compressed%20(3:2).RAF
).


> In the third example, the face is naturally found without any problems.
> No problem occurred.

In the third sample (Sample Person for Testing #1), the thumbnail is offset
from where the facetag is, as per the screenshot. Both the jpg and RAF facetags
are in the same spot, but the thumbnails are not.


> What I noticed about your screenshot is that the entries for Unconfirmed,
> Unknown and Ignored are no longer available.

digiKam has a search function.

https://flic.kr/p/2m7WLdP


> If you have deleted it (which is prevented with current digiKam versions)
> your database is no longer in a clean state.
> 
> Maik

This was tested with a fresh install of Fedora 34 Workstation KDE with a fresh
install of digiKam.

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