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Old 12-09-2010, 02:47 AM   #1
mboyaci
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Consistent EPUB Conversion

Hi,

I have a library of mobi books and a Sony PRS 650 Reader. I am using Calibre to convert my books to EPUB format for reading on the Sony.

For the most part (about two thirds of the books) the conversion works fine and I get a consistent font size and line spacing. Most of the remaining books end up with font sizes that are very small and a few with font sized that are very large.

I tried the small and medium font size settings on the Sony but there is a big size difference between the two so I cannot get a consistent size for fonts and line spacing across all my books.

I have tried several base font size and line spacing settings in Calibre without much success.

My question is how can I achieve a consistent EPUB font size and line spacing for my mobi books during conversion.

Thanks in advance for any assistance.
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Old 12-09-2010, 03:41 AM   #2
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Originally Posted by mboyaci View Post
My question is how can I achieve a consistent EPUB font size and line spacing for my mobi books during conversion.
I use a constant setup with the base font and font size key setup as in the attached image. Occasionally some of the lines of a given html might overlap. When I run into that I just set line height to 1.5pts higher than the base font size. For my setup this ends up being 17.5pts for line height.

You can read more about font scaling here in the manual.
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Old 12-09-2010, 10:47 AM   #3
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Thanks for the reply. I have read the manual several times.

I have tried something along the lines you suggested (limited key) before but I will try your suggestion as well.

I selected three books that have different font sizes on the Sony and opened them in Firefox (EPUB reader) as well as Adobe Digital Editions. The fonts all look the same. I also increased and decreased the font sizes in these books and retried them in Firefox and Adobe and I can see the changes. So the problem seems to be related to my Sony.

Which device should I select for output to the PRS 650 (I now use plain Sony Reader)?
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Old 12-09-2010, 03:14 PM   #4
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I always remove the class="calibre.." attributes from ePubs and then replace the stylesheet.css with my own, specifically tailored for a Sony PRS-300. You could try this and see if it helps - or just copy some of these styles as a test.

Note that all the font sizes are defined in EMs to scale according to the zoom level, (the PRS-300 only has S, M, L).

(To use this file in an ePub, rename the attachment to stylesheet.css).
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Old 12-10-2010, 06:23 AM   #5
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I examined the txt file and it is very impressive. What if anything do I need to change for the PRS 650? Also do I enter this in the extra css section in Calibre?

And by the way the EPUB books that are problematic on the Sony are fine on my iPad.
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Old 12-10-2010, 06:34 AM   #6
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I also have the russified 1.05f firmware on my reader so the userStyle.css file is exposed. Can I enter the contents of the userstyle.txt in this file?
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Old 12-10-2010, 02:09 PM   #7
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Save the file anywhere on your computer and then rename it to stylesheet.css, (the forum wouldn't let me upload it as a css). Open calibre and use tweak ePub to explode an ePub, (one that calibre has generated by conversion as this will have stylesheet.css in it), into its separate folders/files. Copy the saved stylesheet.css over the top of the one in the exploded folder. Close the window which opened for the explosion and hit the "rebuild ePub" button. Send the updated ePub to your reader and see if it's any good.

As for PRS-300 specifics, it's mainly just the font sizes that I have defined. My base font is 0.875em which corresponds to the Small zoom on my reader. I only get S, M, L and I don't know how many zoom level the PRS-650 supports. If you find things too small then simply scale up all the font-sizes in the css file. I have also used a right margin to reduce collision with the annoying small, grey page numbers which Sony readers insist on displaying down the right hand side. (Maybe Sony have got rid of this on the 650).

I have no idea what russified means. Who is Russ?
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Old 12-10-2010, 03:35 PM   #8
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Thanks for the detailed info.

Russified refers to Sony readers with a modified firmware. The firmware is modified by Russian enthusiast(s) thus "Russified". It makes the userStyle.css visible on the Sony Reader. This way any modifications made to userStyle.css gets applied to all EPUB books on the device.
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Old 12-10-2010, 03:53 PM   #9
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Quote:
Originally Posted by Agama View Post
I always remove the class="calibre.." attributes from ePubs and then replace the stylesheet.css with my own, specifically tailored for a Sony PRS-300. You could try this and see if it helps - or just copy some of these styles as a test.

Note that all the font sizes are defined in EMs to scale according to the zoom level, (the PRS-300 only has S, M, L).

(To use this file in an ePub, rename the attachment to stylesheet.css).
But how can you be sure that your CSS will fit the converted eBook's CSS requirements? You can't. So really, it's a crap shoot and my guess is you'll lose more then you will win.
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Old 12-10-2010, 05:07 PM   #10
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Nearly all my books comes from plain text sources to which I then apply markdown, so I can indeed be sure that my CSS will fit the eBook and also achieve a consistent style, which mboyaci was asking about.

Your response also seems a bit off topic and doesn't appear to offer mboyaci any useful suggestions.

@mboyaci : Just have a go and see how it works out for you. My stylesheet isn't intended as a one size fits all your books but as a starting point to help you to achieve your goal.
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Old 12-10-2010, 05:12 PM   #11
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Quote:
Originally Posted by mboyaci View Post
Russified refers to Sony readers with a modified firmware. The firmware is modified by Russian enthusiast(s) thus "Russified". It makes the userStyle.css visible on the Sony Reader. This way any modifications made to userStyle.css gets applied to all EPUB books on the device.
Interesting. I will look it up on this forum.
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Old 12-10-2010, 05:15 PM   #12
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Quote:
Originally Posted by mboyaci View Post
Hi,

I have a library of mobi books and a Sony PRS 650 Reader. I am using Calibre to convert my books to EPUB format for reading on the Sony.

For the most part (about two thirds of the books) the conversion works fine and I get a consistent font size and line spacing. Most of the remaining books end up with font sizes that are very small and a few with font sized that are very large.

I tried the small and medium font size settings on the Sony but there is a big size difference between the two so I cannot get a consistent size for fonts and line spacing across all my books.

I have tried several base font size and line spacing settings in Calibre without much success.

My question is how can I achieve a consistent EPUB font size and line spacing for my mobi books during conversion.

Thanks in advance for any assistance.
Simple answer is.. YOU CAN'T. Not all Mobipocket eBooks are alike. And because of this, you won't get consistent conversions. The best you can do is after the conversions of the ones you don't like, you can go into the ePub and edit the CSS to fit your needs. I do it all the time and in the end, I have an ePub that looks good.
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Old 12-10-2010, 05:17 PM   #13
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Quote:
Originally Posted by Agama View Post
Nearly all my books comes from plain text sources to which I then apply markdown, so I can indeed be sure that my CSS will fit the eBook and also achieve a consistent style, which mboyaci was asking about.

Your response also seems a bit off topic and doesn't appear to offer mboyaci any useful suggestions.

@mboyaci : Just have a go and see how it works out for you. My stylesheet isn't intended as a one size fits all your books but as a starting point to help you to achieve your goal.
The way you suggested using your CSS was to remove body="calibre" with just body and then replace the CSS with yours. That didn't look like a good suggestion. So I said so.
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Old 12-10-2010, 05:45 PM   #14
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The way you suggested using your CSS was to remove body="calibre" with just body and then replace the CSS with yours. That didn't look like a good suggestion. So I said so.
I DO remove all the class="calibre.." attributes from all the xhtml tags and my stylesheet then automatically supplies all the necessary styling and provides instant consistency to my ePubs. (It also has the beneficial side-effect of making each ePub file quite a bit smaller).

Having text/markdown as my source ensures that I don't meet with any esoteric tags which would upset this scheme. I don't have any mobi books but given that the conversion is still to ePub, the principle should still apply. If some of the less often encountered xhtml tags turn up in the conversion then the stylesheet can easily be updated.
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Old 12-10-2010, 06:10 PM   #15
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I know for sure that there is no one size fits all CSS. You need the CSS that fits the XML/HTML.
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