[ComputerGuru]

WebP and AVIIF (and, to a much lesser extent, HEIC, which AVIF is basically a rip off of) absolutely suck for color management since they are a) virtually never original source formats, b) are video codecs. WebP technically supports two different color profile techniques (traditional embedded ICC - broken in every mainstream batch image processor I’ve tried - and nlx video-based color profiles). Unlike WebP and all the other image formats, untagged AVIF can’t be assumed to be sRGB (in part because there is no actual sRGB for video, though close variants exist) and every image processor or image editor will open it with a different base color profile assigned. WebP doesn’t even support exif, making it absolutely horrible for “lossless” operations that effectively aren’t lossless since they necessarily destroy metadata.

HEIC is also a video codec at heart but has a default color space that also isn’t sRGB (which is a good thing; it’s about time we moved on), untagged HEIC images can (though often aren’t in any default workflow) be assigned Display P3. Assigning/assuming sRGB will absolutely break your images, of course.