Quote:
Originally Posted by Chris Jones
Not intrinsically different from the way book covers are handled and this appears to work on all kinds of devices.
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As you have observed, most publishers manage to scale the cover image to suit the screen size. Exactly the same technique can be used for any other image in the book, so why so many fail to do it for images oher than the cover baffles me.
The problem of publishers using absurdly low-quality bitmap images to begin with is another matter, but there is no point worrying about the effects of rescaling a low-quality image when the unscaled image is too small to see properly anyway.
It is possible to set upper and lower bounds on the image size as a percentage of the screen size, so that the image will only be rescaled if it falls outside those bounds. That way there is nothing to lose by allowing the image to be rescaled, as it will only happen on devices where it needs to be rescaled to fit those bounds.
This is not quite what you were talking about, but attached is an example I made that scales a bitmap image proportional to the font size selected by the reader, but with a bound so that it doesn't become too big to fit on the screen if the font size is set very high.
Edit: I am feeling a bit cynical now, because looking through my books in calibre the only case I can find where a publisher has done a proper job of scaling an image other than the cover is an image for an in-book advertisment.
Edit2: Okay I found
this example from Subterranean Press where some of the non-cover images have been scaled properly to suit devices with different screen resolutions.