Good point, I'd be surprised if lighting and orientation doesn't overwhelm all other information at this level of blur. But I've been surprised by impressive d

Good point, I'd be surprised if lighting and orientation doesn't overwhelm all other information at this level of blur. But I've been surprised by impressive digital forensics before—what if you can determine lighting and orientation from the rest of the photo, and then simulate them on each passport photo/mugshot? I'd still feel much more comfortable if they pixelized and color-discretized before blurring, and I still think the aesthetic effect would be much the same.