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Just did a rough ordering and then went through swapping each to see if that improved matters, and ended at a score of 0. I wonder if years of amateur photography and editing has helped, similar to grinding through IQ tests.

The swapping technique seems powerful to me. I do these with a type of bubble sort algorithm which works surprisingly well.

Doubtful, I did the same and got a 0. No photography experience.

I'm curious what you'd be looking for in time spent. It seems to me that it's just a true or false. I personally did it intermittently while I was gaming on my other monitor. If anything, I'd say adding a confidence weighting on each color scale would gather more data.

I did basically the same, and also ended up with 0. Likewise I didn't end up finding any problems swapping adjacent blocks, but it did make it very clear that the order was correct.

I used the same method, got the same result(s).