Thanks for your suggestion. I was already condidering this, because adding cwebp as an optimizer is not too hard. It’s a little tricky though, because Kirby’s Thumb class is not intended to encode images in multiple formats. I could generate the corresponding file, but it would not be accessible through Kirby’s API. As far as I know, every browser that supports WebP sends an additional header to the server to indicates support for WebP. You could check for WebP-Support via .htaccess and automatically deliver the webp version instead of the jpeg if the browser supports it without changing the JPEG. However, this would probably not work with CDNs and would introduce other problems, as the same URL could return different files based on different headers in the request.
I fear that this has to wait a little longer, because it requires additional steps and includes more than just generating the image files. In my opinion, this is not too urgend, because mozjpeg can come very close to the filesizes of WebP, unfortunately not for images with alpha transparency. But I’ll keep an eye on this feature.
If you have any ideas, how this could be implemented, please let me know.
Cheers,
Fabian