Help:Reducing the file size of large PDF or DjVu scanned books
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Some scanned PDF and DjVu books have unnecessarily large file size. It can be made smaller. This page talks about compressing such files.
Compressing PDFs with Cuminas technology[edit]
Cuminas offers a commercial, proprietary technology that claims to create PDFs that approach DjVu quality and size. How would it actually perform on PDF files present at Wikimedia Commons is unknown.