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It's probably worth remembering that they're talking about the average human eye and not you or me. Also, sometimes things that we can't apparently perceive can still effect us. I once saw Paul Simon on some TV Show, decades ago, explaining some of the things that go into composing music. He composed a little song with the help of the show host and explained what he was doing as he did it. At one point he added a note and commented that very few people will recognize that that's the first time that note has been played in this song, but because of that everyone hearing it will still be affected by that even though they aren't aware of it.
It's real easy to show that colors change depending on the colors surrounding them. Perception is tricky stuff and it's not always a yes or no thing.
Anyway, that 300dpi may really be a limit but I don't think anyone, not even those investigating this stuff, can be truly sure of that. And even if it is a limit for me it might not be for you.
Barry
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