Nothing is impossible in dreams. I can't prove that dreaming a new color is possible, but you can't prove the opposite either.
This is only my opinion, I'm not saying that it is correct.
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If they are not visible to the human eye, then we can't see them. The computers only converted them to colors that are visible to us, but if we'd have super all-color-seeing eyes, I'm pretty sure they'd look different.
Take a color blind for example. Let's say he can only see the blue color (every color he sees is blue). He has no idea how green or red looks like, and even if he'd look at red on a computer, his eyes would still perceive it as blue.
but the range of light frequencies there are have been used up (exept for inbetween colours, but they dont really count because they are so close to ones we know) and the light frequencies outside that range arent classed as colours, because they are totally diferent things, exept that they are still part of the electromagnetic spectrum.
andyway, back to the original topic. many people have flew before in an LD, but not in real life, so that means that it is possible to do things we havent experienced, and the way that it feels is things we associate with the thing you are doing, e.g. when you think about flying, you think about wind rushing past you and if you are going fast, some g-force, so you would remember back to when on a rollercoaster, and thats how you feel.
Some people keep saying its impossible because the electromagnetic color spectrum or whatever says you can't, but... There IS NO LIGHT in dreams, its completely imagined, correct? Could it not have a new color in the spectrum? The point is that dreams aren't based on real life, they're based on imagination. I think the verdict in that other debate was that it was impossible, despite someone saying they had experienced it... I think it would probably be pretty hard to do though, or it might happen by chance.
I disagree here.
Take for example flight: while at first my flight in dreams was based on the feeling of swimming, one day I discovered how to really fly, as a new experience (it was hard to discover the first time, but after that it became easier and eventually like a sixth sense). It's impossible to explain, it's like trying to explain how you move your arms or how you breathe: you just feel it.
To see a new color you just have to experience something new, you don't have to actually control it. So I imagine it'd be easier than flying, having 4 arms, 360 vision, etc.