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KevinH · 10-26-2019, 07:53 PM

Check the epub2 and epub3 standards for recognized file types. Epubs are not web pages. The latest is here. webp images are not in the supported core media list.

https://w3c.github.io/publ-epub-revi...epub-spec.html

So even if Sigil added it, it can not be used in epub2 at all and can only be used in epub3 if you specify a fallback resource which I have never actually seen.

I would be happy to add support to webp images to Sigil if you provide references for the proper media-type. But many validators and many existing ebook readers will not support it as it is not a supported core media type even in the latest epub3 spec.

So choosing webp for a epub is probably not a good choice.

10-26-2019, 07:53 PM	#2
KevinH Sigil Developer Posts: 8,859 Karma: 6120478 Join Date: Nov 2009 Device: many	Check the epub2 and epub3 standards for recognized file types. Epubs are not web pages. The latest is here. webp images are not in the supported core media list. https://w3c.github.io/publ-epub-revi...epub-spec.html So even if Sigil added it, it can not be used in epub2 at all and can only be used in epub3 if you specify a fallback resource which I have never actually seen. I would be happy to add support to webp images to Sigil if you provide references for the proper media-type. But many validators and many existing ebook readers will not support it as it is not a supported core media type even in the latest epub3 spec. So choosing webp for a epub is probably not a good choice. Last edited by KevinH; 10-26-2019 at 07:57 PM.