One BIG problem with grading a card based on photo contrast is that many 19th century cards have light contrast simply because they were taken with a lighter background, while others have better contrast only because the background and player are darker.
So to grade on this basis of contrast would have the effect of not grading the card's condition, but grading the photographer's skills. This is not the grading company's job, to rate the photographer's skill.
Also, to slab every 19th century card as "A" is a disservice because it doesn't differentiate the altered cards from the non-altered cards.
I've thought about this quite a bit but I keep coming back to this Churchill-esque conclusion: letting the market settle these disputes is the worst system, except for the all the others.
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