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Do all humans see all the colours exactly the same?A tree is green for me but for others ?

When i look at a tree , i see a colour ,and call it green; when you look at a tree , you see a colour and call it green.
But is it really the same colour? Your green may be brown for me , can't it?
when you tell me "green" I imagine a different colour from your green but I call it green. I mean, suddenly, if I exactly were you, I could sense the colour of a tree as brown or another colour. From childhood to now , I look at sky and call it blue, now suddenly if I become completely a different person (but not losing my memory) , do I call the sky's colour blue?
And how can be sure on it or how can we compare it and how can we measure it?
thank you for reading. plesae make me relax =) i want to sleep

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  • Jul 12 2012: Yes, in fact, it is the same green. The chemical pathways that the eye takes to perceive the different shades of red, green and blue are the same between eyes, at least according to the law of averages. Of course, some people might be color blind, or have hyperactive cones, but either way, the way that the eye takes the information of light remains the same.

    Considering this fact, what makes light show different colors? This is very simple, the wavelength that light takes is what determines it's so called 'color'. The way that humans have adapted to take electromagnetic waves into the different colors of the rainbow from red to violet is how we've evolved to take these energy waves, and absorb them as information in our body the best possible way.

    So the color green that you see from one tree will be the exact same green as of another tree, as the light reflected off the leaves will be the exact same wavelength, no matter where it bounces off towards. The tree itself is actually all colors except green, it absorbs all the colors, and the only reason that we see green is that it doesn't absorb a specific wavelength of green, which it reflects and our eyes absorb and our brain takes as information.

    Hope this helps answer your question!
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      Jul 17 2012: All we have to do to answer this is to consider colour blind people.

      Addition:One in ten persons has some degree of colour blindness.
      • Jul 17 2012: There are multiple causes of blindness, however the root cause is that the chemical pathways that the eye takes to receive energy and information is disturbed in one way or another. Simple. However, the light energy and information that is being transmitted with the photon is still the same, no matter what.

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