Few digital libraries offer high quality scans that allow paper structure and ink layer thickness analysis. But, is it worth to use them create a few GB PDF/DjVu if books are mainly intended for reading and not for scintific reserch on printing technology? We should not reject any usable resolution. Ankry W dniu 2017-05-22 21:03:37 użytkownik Yann Forget <[email protected]> napisał: As others say, 2 Mpixels should be the minimum resolution, although it is a bit small to do any work (i.e. restoration). That's the minimum requirement for quality and featured images on Commons. For doing restoration, it is quite comfortable around 12 Mpixels (4000 x 3000). That's what most cameras offer today.
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