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My experience, and from what I've read, is that converting from pdf to any other format (epub/mobi/html, etc) is quite difficult in the sense of maintaining flow of the original book.
I am trying (and have tried) various ways to convert to altered pdfs, as well as to html, and it never looks as good.
Nevertheless, there are two programs you can try:
- k2pdfopt
- pdfmasher
Pdfmasher allows you to have perhaps the best control of output quality, but it does not retain any images/pics in your book.
K2pdfopt employs an algorithm to take various 'snapshots' of your pdf book, which effectively enlarges them and makes it easier to read. This one does retain the images/pics but sometimes is inconsistent in font size and formatting. Plus the output file (which remains pdf) is quite large.
I use Calibre for most of my ebook conversions and tweaks, but not when starting with pdf format. I find it does not do nearly as well and sometimes just 'hangs' on the conversion and never finishes.
Good luck!
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