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Need help to extract scans from a webapp

No.1543479 View ViewReplyOriginalReport
I am looking for high-res scans of the medival document "Les Très Riches Heures du Duc de Berry", and it just so happens that the museum owning the document has created a web app with exactly what I am looking for:
https://les-tres-riches-heures.chateaudechantilly.fr/
(you need to select a language and then "open the book")

However, because it's a web app or something I can't right-click -> save nor open the source code of the page. If I use JDownloader, it detects the pictures but it's only low-res versions.
Is there a way to extract the raw images from that thing ?