This is addressed somewhat in the "The critical window of shadow libraries" post > Until now, the only options to shrink the total size of our collection has b

This is addressed somewhat in the "The critical window of shadow libraries" post > Until now, the only options to shrink the total size of our collection has been through more aggressive compression, or deduplication. However, to get significant enough savings, both are too lossy for our taste. Heavy compression of photos can make text barely readable. And deduplication requires high confidence of books being exactly the same, which is often too inaccurate, especially if the contents are the same but the scans are made on different occasions.