Image processing, highlighting hidden details

[ReneZ]

I added a few more images to the second page: You are not allowed to view links. Register or Login to view..

These are from quire 13 and show a few more interesting artefacts.
I think that overall the variation in colour/darkness is very hard to interpret.

As requested by Tavie, I have now added all ink false-colour images of Q13 and Q20.

For consistency, I renamed the page to:
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