The internet archive at archive has a lot of interesting books for borrowing and downloading. I have some downloads of older books, that are difficult to read on E-Ink devices because they include the background of the page, which has become yellow. So the contrast is low and the text becomes unclear, also the files are quite big. So I wonder if somebody knows a good way to trim the PDFs for ereaders. I would prefer to use a commandline on a Linux based system, if such a tool is available here.
An example of the PDFs I am looking at is this:
https://archive.org/details/smtliche...ge/n8/mode/2up
(This is the item page, the download link is here
https://archive.org/download/smtlich...r16goet_bw.pdf
Any help appreciated, Ctop