Quote:
Originally Posted by kovidgoyal
IIRC both mobi and azw3 support PNG images. Various older kindle renderers have issues with some PNG images, which is probably why kindlegen doesn't support them.
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I think it very likely that these troublesome "renderers" would be limited to mobi/kf7 anyway, so to enforce this conversion for AZW3 is pretty annoying.
Though since the standard setting is to make a hybrid file with both kf7 and kf8, that would mean duplication of some images (I'm assuming that the images are shared between formats; only the text different, I could well be wrong). I'm currently just doing some books to load on my own Kindle. I do occasionally code books for publishing though, so I need to follow the standards Amazon set, implicitly or otherwise.
Many ebook designers do use png in making epubs, then just convert using kindlegen. And their images are silently degraded.