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Thanks everyone, particular tuxor and eLiNK (by private msg.), those files work fine! It seems the png-version from tuxor has better contrast ...
I had the chance to check this pdf in Adobe Acrobat, it reported two images per page, one is the scan, the other has the "interpolate flag" set, so this is probably where the problem is. Would anyone know how to get rid of all those extra images (they also have smaller res) besides exporting and reimporting, i.e., some kind of batch process of preflight fix?
Thanks again!
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