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PDFs vary in ability to convert. If convertible at all, Word, Writer or other tools are far better than Calibre for PDFs. Then convert a docx to epub.
Unless you OCR, all you can do with an image based PDF is crop, resize, contrast/brightness/bit-depth.
I'd only use Calibre to catalogue and transfer existing PDFS as PDFs to ereaders or tablet that can manage them.
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