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Old 11-07-2013, 11:36 PM   #1
ittiandro
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EPub conversion problem with Calibre

I have a bunch of e-books in Djvu format which I want to convert to EPUB for use with an Android tablet I just ordered. Since I couldn’t find any software converting directly from Djvu to EPub, I am trying do do it in two steps: converting from Djvu to to PDF and then to Epub with Calibre.
I tried many softwares ( PDF Lite, Nova PDF, A-Pdf to Djvu) . The conversion to PDF is OK, but I cannot get the final conversion to E-Pub in Calibre: the last (free) software I tried ( Boxsoft) looks very user friendly, but even with it I cannot convert to Epub. At least I am getting some symptoms of what is going wrong: when I load the viewer in Calibre , it takes a minutes or so for the Epub file to get loaded: it says “ loading e-book” then “ loading flow” and finally I get a page filled with black bars instead of the printed lines… Sometimes I also get a warning about a script problem..
Does anybody know what is the problem and how can I solve it? I don’t know if the problem is with Calibre or with software used to convert to PDF.May be I should find an alternative to Calibre.

Thank you for your help

Ittiandro
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Old 11-07-2013, 11:59 PM   #2
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Maybe this would work?

https://cloudconvert.org/djvu-to-epub
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Old 11-08-2013, 12:28 AM   #3
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That looks interesting.
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Old 11-08-2013, 03:01 AM   #4
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Djvu, being a format that stores images of pages rather than text, is not going to convert well to EPub. Converting Djvu to PDF doesn't magically convert the Djvu images to text. It just creates a PDF full of images. The only way you're going to get that converted to a usable epub is if you do OCR on the images (probably easiest to do once you've converted to PDF). Of course OCR is not perfect, so after you've done the conversion you'll have to go back through the book and edit all of the mistakes it made.

If your end goal is just to be able to read your Djvu books on your Android tablet, a much better solution is to get a Djvu reader for Android (I have no affiliation with that app, it was just the first hit when I googled for "android djvu reader").
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Old 11-08-2013, 04:51 AM   #5
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I'd recommend going back to wherever you bought your books from, and seeing if they supply them in a more "device-friendly" format. DJVU is great for things like magazines and comics, but it's really not a format that's intended for use with books.
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Old 11-08-2013, 04:57 AM   #6
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Quote:
Originally Posted by toddos View Post
Djvu, being a format that stores images of pages rather than text, is not going to convert well to EPub. Converting Djvu to PDF doesn't magically convert the Djvu images to text. It just creates a PDF full of images. The only way you're going to get that converted to a usable epub is if you do OCR on the images (probably easiest to do once you've converted to PDF). Of course OCR is not perfect, so after you've done the conversion you'll have to go back through the book and edit all of the mistakes it made.
+1 on that

Footnote: yet another thinking that calibre is some kind of magic wand.
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Old 11-09-2013, 01:27 AM   #7
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Would you consider converting the DejaVu to HTML? It isn't easy, but I've done it a couple of times.
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