I think it can be done. https://www.google.com/about/datacenters/gallery/images/_2000/IDI_018.jpg https://www.google.com/about/datacenters/gallery/images/_200.

I think it can be done. https://www.google.com/about/datacenters/gallery/images/_2000/IDI_018.jpg https://www.google.com/about/datacenters/gallery/images/_200... F12 your browser open dev tools limit bandwidth to slow 3G, observe that the grey channels comes out first. JPEG can have arbitrary progressive scans.