It'll be the de-screening option that makes the text fuzzy, but you'll need it for the pictures or you'll get a moire pattern. Best thing to do depends on what you have in mind for a final product. If it's OCR, scan the text separate without any de-screening. If you just want a set of pictures with text on them, scan them at double the size you want them to be without the de-screen, apply a gaussian blur to the images only, then resize the whole thing down 50%. That's pretty much what the de-screener on cheap scanners do in memory, but if you do it yourself you can undo any results you don't like.
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