Wow. Thank you for posting this. I think it's the best thing I've ever seen on THN. Seriously, thanks again. What a masterpiece.
You're welcome. The Bosch Project has ultra high res scans of all HB's collected works. I'd love to find documentation of the author's scanning process. The web interface shows what I'm guessing are multispectral versions of some scans but it could also be post processing of the visible light version.