Automated Card Grading - Surface

[steve B]

I'd like more details on what's considered to be a perfect surface. Before about 1992 the cardstock itself had not exactly texture, but the stock wasn't perfectly flat. I can't see downgrading something for the way the paper was originally made.

How would this handle something like 93 Upper deck, where a portion of the set has three different ways the gloss on the back was applied.
Gloss only on the picture
Gloss on the picture with an added gloss layer over the entire back
Overall gloss.

Foil stamping can be impressed more or less deeply on any foiled card. How is that measured from a mostly straight on photo? And what tolerances are used? Like when is it too deep or shallow so it's a point against?