djvu file is less than half as large as the PDF. This is from a Linux directory listing showing a PDF of a book made with the method that preserves the look of the original pages. If you do the first method, DjVu can help give you smaller file sizes. The second method (entitled "The Easier Road: Scan Tailor") looks for pages with nothing but text and makes these pages have pure black letters on a pure white background. The first method (entitled "The Road Less Travelled") preserves the look of the original page, including the color of the paper, the margins used, etc. In the chapter on creating book scans, I talk about two methods of doing them. Making a DjVu is more work than making a PDF, so you need to know when it is a waste of your time. The most surprising thing I learned is that DjVu does not always give a smaller file size than PDF! Since the only reason to prefer DjVu to PDF is to get a smaller file that uses less memory, it is important to understand when PDF will give the smaller file size. Writing this book has been a real education for me, and I learned a few things I did not expect to learn.
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