We would find HEIC image support incredibly valuable. I understand that it only works in Safari, but we could easily implement custom JavaScript in our theme or injection code to only show it for Safari users.
Right now the image uploader simply will not allow uploading HEIC at all. If this was even a Lab feature we had to enable, so people don’t do it by accident, it would be great.
(the reason we’d find it important is that Safari on Apple Vision Pro will soon support Spatial Photos, so we want to be able to embed these photos in our Ghost articles so that Vision Pro wearers can see them in 3D!)
I probably wouldn’t recommend to use HEIC at all until search engines start to handle it properly, because it can drop your SEO (Search Engine Optimization) metrics significantly
When you try to measure the performance and metrics of yuor blog using let’s say https://pagespeed.web.dev/ then you’ll find out that the big size image of the non next-get format is a bad idea.
Why serve images in AVIF or WebP format?
AVIF and WebP are image formats that have superior compression and quality characteristics compared to their older JPEG and PNG counterparts. Encoding your images in these formats rather than JPEG or PNG means that they will load faster and consume less cellular data.
I personally see the impact of images to the SEO and that is why recommend to constantly monitor your blog.
I described in my blog how I fixed some of my problems to improve my metrics
Regardless of whether you find a way to insert HEIC or not it should be helpful
I think the primary request here is to support HEIC format being uploadable. Ghost would then convert HEIC into one more other formats optimized for the web.