[Digikam-devel] [Bug 262577] Scanning collection for new faces (skip already scanned images) does not do anything

[Milan Knizek]

https://bugs.kde.org/show_bug.cgi?id=262577





--- Comment #2 from Milan Knizek <knizek volny cz>  2011-02-06 08:34:51 ---
I tried again, while checking the internal tag in the database. You're right
re. the "Scanned For Faces" tag - it works as expected.

The problem is somewhere else - I am not sure if it is a bug or not:
1) When digiKam scans images for faces, it tags them internally in db with
"Scanned For Faces". The tag is not written to image.
2) If the user creates a redundant copy of the image (even directly in album
view - e.g. copy and paste and name it image_copy.jpg) digiKam immediately
recognises the image in the albums view.
3) In digikam4.db, the image_copy.jpg is tagged as "Scanned For Faces"
4) However, image_copy.jpg is not shown in Faces view among those scanned
(neither in People/Unknown or elsewhere).

Therefore, running the scan for faces again (w/o clearing previous results)
does not scan the image_copy.jpg.

It seems that digiKam copies internal structure of tags from image.jpg to
image_copy.jpg, but the "faces" extension does not include the image_copy.jpg
in the results.

(I tried to edit the image.jpg in external directory outside of digiKam albums
and then copied it back. It was not tagged as "Scanned For Faces" - so it leads
me to an assumption that digiKam recognises images based on a file hash.)

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