The NES output analog video to a television, right? Thus luminance/chrominance modulation. The exact colors would be uncalibrated and dependent on the scaling and biases of the output device; if the emulators are trying to emulate that and using different curves…
(If it's just the brightness it might well be global gamma correction, which of course can also have an effect on color perception.)
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Date: 2013-07-17 05:07 am (UTC)(If it's just the brightness it might well be global gamma correction, which of course can also have an effect on color perception.)