Quote:
Originally Posted by scanner
nope, it's not about thin paper, it's about book page (the half of the book is at the back of the page I scan)
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This is bleed-through from the pages
behind the one that you're scanning, and/or from the reverse side of the page itself.
The Opticbook 3600 comes with a thin sheet of black plastic (stored behind the white background on the lid). In order to improve the scan quality on pages with a lot of bleed-through, you need to insert that sheet of black plastic between the page-to-be-scanned and the pages following it. Because it's solid black, it will counteract most if not all of the bleed-through. That will produce a cleaner, crisper scan with letters that are more easily recognized by the OCR software, plus it will reduce or eliminate the presence of the "black dot" artifacts that you mentioned.
When scanning manga printed on either finer or cheaper paper, for example, using the black sheet for backing is often essential to getting an acceptable scan. The same holds true for scanning text content from, for example, fanzines, which are often printed on thinner, cheaper paper, and, in the case of older publications, may have even been originally produced by a dot matrix printer and then photocopied. Using the black plastic sheet slows down the scanning process considerably, as it means adding an extra step to move the sheet between scans, but it's time well spent.