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Old 04-01-2019, 06:44 PM   #91
maximus83
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Quote:
Originally Posted by jackie_w View Post
KTE never does a full conversion to kepub, it only does a format-shift from epub to kepub.
Not familiar with that term, what is a 'format shift' and how does that differ from conversion? Do you mean just renaming the file extension, or are there additional steps it does?
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Old 04-01-2019, 08:09 PM   #92
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Originally Posted by Gorcsev View Post
thank you

Unfortunately what are the kepub expectations for the best rendering result is not very well documented.
For the record, kepub is not any sort of open standard. It is a Kobo only thing and they don't publish much about it. Strictly, it is for books purchased and downloaded from their store to their devices and apps. Again, they don't really support sideloading kepubs as a normal reading format. The only reference to sideloading them I have seen is for book creator to sideload a epub as a kepub for testing purposes.

The only thing that Kobo put out about kepubs is https://github.com/kobolabs/epub-spec. And that is about how to produce good a good input epub for the processing they do. Everything else we know has come from examining the purchased kepubs and experimenting.
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Old 04-01-2019, 08:24 PM   #93
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Quote:
Originally Posted by maximus83 View Post
Not familiar with that term, what is a 'format shift' and how does that differ from conversion? Do you mean just renaming the file extension, or are there additional steps it does?
The calibre conversion does a lot more than what the KoboTouchExtended driver. It will probably change every element in the book. It actually works by converting the input book to a common format and then writing that to the output format. In doing this, it will probably completely rewrite the CSS. As well, elements of the HTML code will change, the internal files can be split or merged, the ToC can be rebuilt and lots of other things will happen. Plus it can make changes to what the book looks like when read.

The KoboTouchExtended driver "simply" wraps spans around each sentence in the book. And adds a couple of divs around each chapter. It doesn't change the existing CSS, the internal file structure or the ToC. It shouldn't result in any difference in how the book looks like except what is inherent in using the kepub renderer instead of the Adobe RMSDK.

I usually use the word "transform" to describe the action of the KoboTouchExtended driver to distinguish it from a calibre conversion. I can't decide if "Format shift" is a better term for this or not.
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