[digiKam-users] Extract thumbnails from thumbnails-digikam.db

[Gilles Caulier]

hi Dmitri,

Hey no, it's not a JPEG image, it's PGF image image (using wavelets
compression). It's better than JPEG in speed, quality, and size.

To convert this PGF t PNG for ex, use my CLI tool from my github account :

https://github.com/cgilles/digikam-pgf-database

Best regards

Gilles Caulier

Le mar. 8 juin 2021 à 18:20, Dmitri Popov <dmpop at tokyoma.de> a écrit :

> Hello,
>
> A technical question from someone who has no idea what he's doing. :-) I'm
> trying to exact a thumbnail directly from the thumbnails-digikam.db
> database, but this command gives me a file that is not recognized as JPEG:
>
> sqlite thumbnails-digikam.db "SELECT writefile('thumbnail.jpg', data) FROM
> Thumbnails WHERE id=1;"
>
> What am I doing wrong?
>
> Thank you!
>
> Kind regards,
> Dmitri
> ---
> Tōkyō Made - https://tokyoma.de/
>
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