Images never existed in RGB at any point when the NES was generating them. They were output as an NTSC signal and the colors you got depended entirely on each TVs particular analog NTSC decoder. As such there can never be a universally agreed upon "correct" palette as every outcome is just someone's approximation of what it should have looked like based on whatever methodology they employ to come to that conclusion.
Anyone that has ever tried calibrating older TVs knows that it's the wild wild west in terms of what you can expect. Manufacturers often played with their color decoders trying to make their TVs stand out in the stores and employed lots of nasty tricks that make for terrible images.
Anyone that has ever tried calibrating older TVs knows that it's the wild wild west in terms of what you can expect. Manufacturers often played with their color decoders trying to make their TVs stand out in the stores and employed lots of nasty tricks that make for terrible images.