I had recently the opportunity to compare two scans, one from Google Book Search, another from Gallica (French National Library) and I could not help remarking a big quality difference. The Google product was clearly the best, the other one hardly usable and I could not help wondering how to explain this difference.

The thread in French language is here:
https://www.mobileread.com/forums/sho...252#post447252
Looking at the news today, it seems that Google made good use these past years of a technological secret.
http://news.cnet.com/8301-11386_3-10232931-76.html
Can Gallica and other national European libraries now catch up? Some millions books later, Is the "battle of the scans" over? Google won?