You're probably aware of this, but the comparison tool allows selecting larger images. That first image is 3 bpp if you select "large".
> Usually we store images at 3.5 - 5 BPP (Cameras)
That's appropriate for JPEGs, but given that more recent compression algorithms do a better job, it's probably worth looking at lower bitrates. I pulled some JPEGs off my Canon DSLR for example, and they're around 2-4 bpp for landscape photos.
It's not surprising to see acceptable JPEG XL images with half that bitrate.
> Usually we store images at 3.5 - 5 BPP (Cameras)
That's appropriate for JPEGs, but given that more recent compression algorithms do a better job, it's probably worth looking at lower bitrates. I pulled some JPEGs off my Canon DSLR for example, and they're around 2-4 bpp for landscape photos.
It's not surprising to see acceptable JPEG XL images with half that bitrate.