> I'm also at a loss as to how you could use any kind of camera or image that didn't depend on the reflection of light. You're conflating "high lighting reflec

> I'm also at a loss as to how you could use any kind of camera or image that didn't depend on the reflection of light. You're conflating "high lighting reflection" with "lighting reflection." Lighter faces reflect more light, but if you calibrate your instruments properly you can get just as much information out of a picture with less reflected light.