He also said this: (underline added by me)

Quote - There are a number of gamma checkers and so-called 'calibration' patterns out there on the web that will give an entirely false reading or setting of your system gamma.
They're all based on the same fallacy: That of using a dithered pattern which is too small to properly represent the correct brightness value(s). (For the technically minded; the problem is caused by the risetime of most monitor hardware not being sufficiently fast to turn from full black to full white in the space of a single pixel, or even two, in some cases.)

Hello dude it is 2009 - nobody uses scanning monitors any more. We all have LCD displays where each pixel is a real independent device and can show any color perfectly regardless of what its neighbors are showing.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)