Sam Wilson, 27/01/2017 00:10:
On a related note: most (all?) IA-scanned books have e.g. *_jp2.zip files containing all the original scan images, but is there any standard for user-uploaded books? Like your librarians above, I assume they're uploading individual jpg/png files? Do these get combined into a single zip?
https://en.wikisource.org/wiki/Help:DjVu_files#The_Internet_Archive covers this.
Nemo