Quote:
Originally Posted by DNSB
Yes, Jon, I know it's the default. I also know that I've seen too many ebooks where it's been set to "none" or other equally useless for my purposes value. Hence when I start editing an ebook, I run a saved search to set it to "xMidYMid" just to save me from having to re-edit. It is a waste of bytes but I think I still have enough gigabytes of storage that wasting 4 or 5 compressed bytes doesn't concern me.
As for your second point, considering the number of ebooks that do not have a pbook variant but still use a 16:9 or higher aspect ratio for the cover image, I'm not sure if the pbook aspect ratio has much if anything to do with the odd choices used by whomever created the cover image. I tend to suspect that they wanted the cover image to fill a 16:9 or 16:10 phone/tablet display. As the 18-19.5:9 phone displays get more common, I suspect we will find more covers sized to fit those displays.
And here we are with our humble eInk ereaders with a 4:3 (though I've seen one referred to as having a 12:9) aspect ratio.
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The reason I mentioned not needing preserveAspectRatio="xMidYMid meet" is that if you are editing an SVG wrapper and cannot remember the correct form, you can just remove it.