Photo restoration with GIMP
For photo restoration, it is essential to install the Resynthesizer plug-in in GIMP. This plug-in is found in the Fedora repositories.
[root@amd64 ~]$ dnf install gimp-resynthesizer gimp-help
Its use is very well demonstrated in a Davis MediaDesign film.
I recommend scanning each photo in two formats, tiff and jpeg, both without compression and in the following resolutions:
Regarding the export of the photos in GIMP, I recommend reading the chapter "6. Getting Images out of GIMP" of the User Manual.