[digiKam-users] Extracting thumbnails

[Gilles Caulier]

Hi,

I prepared a small set of codes to load compressed blob file from
database and convert to png.

It's on my github account here:

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

To compile, you need Qt5 devel package (core and gui) and cmake :

git clone https://github.com/cgilles/digikam-pgf-database.git
cd digikam-pgf-database
mkdir build
cd build
cmake ..
make

enjoy...

Gilles Caulier

Le mer. 13 mai 2020 à 14:39, Wesley Smith <wss7932 at gmail.com> a écrit :
>
> Ok. So that is a little beyond my knowledge base. Is there a way, having exported the blobs, to decompress them?
> On May 12, 2020, 11:28 PM -0500, Maik Qualmann <metzpinguin at gmail.com>, wrote:
>
> The actual blob is first of all a QByteArray compressed with qCompress.
>
> Maik
>
> Am Mittwoch, 13. Mai 2020, 05:05:41 CEST schrieb Gilles Caulier:
>
> Hi,
>
> blog are images in fact in wavelets compression format PGF :
> https://en.wikipedia.org/wiki/Progressive_Graphics_File
>
> Best
>
>
> Gilles Caulier
>
> Le mer. 13 mai 2020 à 04:56, Wesley Smith <wss7932 at gmail.com> a écrit :
>
> I have managed to lose an entire collection of images spanning years.
> I've tried every way to get them back but, they are gone. I can still
> see all of the thumbnails and so I know I can somehow extract them but, I
> don't know how. It's the only thing I have left of them. I know they're
> small but, that's better than gone. I have tried opening the database in
> sqlite browser and extracting, I've tried a python script that was
> hopeful but, the files exported are not images, just *.blob. What can I
> do?
>
>
>
>
>