Codex Atlanticus, by Leonardo da Vinci, 1119 pages, spanning years 1478-1519

You can find higher-quality JPEGs (yes, still lossy, and not super high quality) by replacing:

Thumbnail:

https://codex-atlanticus.ambrosiana.it/assets/100/000R-220.j...

Direct Image URL (default, 500 pixels wide)

https://codex-atlanticus.ambrosiana.it/assets/500/000R-220.j...

Higher Quality (2,000 pixels wide)

https://codex-atlanticus.ambrosiana.it/assets/2000/000R-220....

Obviously, you could script something to grab them all (like `for i in {1..1118}; do wget "https://codex-atlanticus.ambrosiana.it/assets/2000/000R-$i.j..."; done`) I don't know what other directories like 100, 500, or 2000 are available, but there might be something higher than 2000.

I'm lucky enough that I can buy tickets and look at the manuscript in person this afternoon, but I can't help but feel this should be open source

You can download a copy for yourself at https://news.ycombinator.com/item?id=19948598

This is a great effort but the image quality isn't very high for me, it's quite blurry.

At what DPI was this scanned? Or is it an artefact of the images being compressed JPG files?

How can I get everything in a single PDF?