Note that the term transmission refers to the physical process of radiation passing through a sample, whereas transmittance refers to the mathematical quantity.

Now, if we turn the polarizers around just a little bit, we can actually bring that specular reflection of the skin back in, and you can see she looks kind of shiny and oily at this point.

And in addition, we've actually used polarizers on all the lights just like polarized sunglasses can block the glare off of the road, polarizers can block the shine off of the skin, so we don't get all those specular reflections to take this map.

So, if we use information that comes off of this specular reflection, we can go from a traditional face scan that might have the gross contours of the face and the basic shape, and augment it with information that puts in all of that skin pore structure and fine wrinkles.