There is another wrinkle to add to the mix. Would this system be able to detect the differences between a card that was actually printed on the lighter side (from a dearth of certain colors of ink at the factory) and one that has spent time in the sun and faded?
Here's an example of what I'm talking about...
1969topps567three.jpg
The top two look faded, but considering their coloring is identical (both were submitted by me and weren't left out in the sun or anything), they actually came out of the factory that way, so PSA graded them accordingly (Although, perhaps the 6 was graded accurately by one grader, and a different grader hammered the no creases/wrinkles 4 for being 'faded'?? Who knows.).