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I had this same problem when scanning some of my old physics books. The problem is that the scanned text is usually dark grey rather than black, and the poorer contrast of E-Ink displays makes it hard to read. I ended up writing a Java application for selecting rectangular regions in the scans to leave as grayscale, and changing everything else to black or white. The SK program that @osnova describes sounds better than my home-built job. My only point is that you should convert the text to black and white to improve the contrast.
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