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Wed Apr 17 13:17:15 BST 2019

program need to be written instead to use command line.

To check, i have used a slow computer (my old laptop PIII-600Mhz) and
see from command line which conversion generate target files speedly.
I can see JPG very fast and PGF is a little bit faster than JPEG2000.

All test files are available here, if you want to check visual image
quality : http://digikam3rdparty.free.fr/misc.tarballs/testdbthumbs.tar.bz2

So, JPG sound like the best candidate...

Your viewpoints ?

Gilles Caulier