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How do you know the unnoticeable pixellation of the blue isn't an artifact of the way blue is displayed by your screen?

If you have an LCD screen with a normal RGBRGB pixel layout, you really can't expect problems. Then again, you can always use a magnifying glass.

So, my screen doesn't display blue in a way that pixellation is visible to the human eye, and this is somehow not an issue with the human eye how?