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Originally Posted by tkeo
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Yours is probably the best approach for source/epubs that are going to be edited and then run right back through kindlegen. That's what Amazon suggests, actually--to get around their no cover-page "rule" with epubs as the source. For those who may be using KindleUnpack simply to get a clean(er) epub from a KF8, that may not be in their best interest. But it can be easily changed in an editor in that case, too.
I would stick with your approach, though. I asked mainly because I couldn't find where that string was created, at first glance.
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I thought it needs an extra library like PIL. To avoid using the extra library, I wrote that style.
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I thought the same thing (PIL)! Then a search turned up that particular method.
I guess in a perfect world, I'd like to see the dimensions stored in the same dictionary as the image names when the image data is first extracted--so there'd be no need to re-read that file in the cover-page creation routines--but that's for a future rainy day.
Of course, I quickly cobbled that together--I suspect it might break easily. Probably needs to be some basic error-handling to make it die a little more gracefully if that happens.