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Originally Posted by stumped
But I am puzzled by the amount of work that someone-the publisher? - has devoted to creating a huge set of not very compatible images, brus stroke by brush stroke.
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No, no many work. If the original formulas were written -for example- in latex (a common task if the ebook is about cientific matter and also was printed as .pdf), to convert the formulas as .svg it doesn't take a lot by using -for example- a tool like
dvisvgm.
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The workaround. Checking Amazon Kindle store ,they offer the book cheaply. I grabbed the free sample into kindle for android on my same tablet. The kindle version has equations what scale up and down when you change text size, and are blacker and at the same size as the text.
And presumably, if I bought it and converted to epub I would have something that works on all my devices.
Will look at the kindle sample book code later.
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Amazon utilzes a different render engine. For .azw3/.kf8, employs Webkit (the same engine as Sigil); for .KFX Amazon only supports partially .svg images and converts them as .jpg; and it doesn't have any support for the .kf7 format.
Your workaround (convert a Kindle ebook into an epub) won't work for all epub reader devices, especially if the Kindle ebook you are going to download is a .kf8 one because Amazon won't modify your .svg (maybe you are a lucky man and the downloaded ebook is in .KFX format -I doubt- and all your formulas were converted in .jpg). If you, now, without any change, open your epub with PocketBook, your formulas will display well. But that is because PocketBook has two render engines: RMSDK and WebKit. Another reader device not based in WebKit will have issues with your .svgs. Convert your .svg as .pgn (a better format than .jpg for formulas), it's your best bet.