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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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    Gail .

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    Jul 16 2012: My husband looks at light green and sees blue, and looks at blue to see grey. His ability to distinguish among approximate colors is lacking.
  • 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.
  • Jul 12 2012: On a lighter note, I feel pretty sure that men and women see colors differently.
    Or maybe it is just husbands and wives.
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      Jul 11 2012: Colour as such doesn't actually exist, it is mere refraction of different wave lengths of light which react differently from each other upon our retina.
      Temperature exists, it is a human measure of heat which is energy, the best way to measure it would be in Kelvin.
  • Jul 11 2012: if the lie canbe accepted and recognized by majority which will come to be the truth
    conversely, if the truth cannot be accepted and recognized by majority which will be a lie
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    Jul 10 2012: Hello Ömer,

    thank you for your interesting question.

    At the moment there is no possible way to find out if YOUR perception of color is the same than MINE. Comparison by language can not be done, as we would have learned the same names for colors yet its sensations could be completely different.

    I don't know if it would be possible one day to compare the pattern of 'interpretation' which color would induce within our brains, our visual cortexes. Yet even though we could measure those patterns, we would still not know how individually their sensations were.

    So my sensation for 'green' could be identical to your 'red', and my 'red' could be your 'blue'. We will never find this out just by comparison, as such a phenomenon would stay consistent in all shades by the consistence wavelength of the light. If it was different, we would be able to describe the sensation of color to a natural born blind person, what we can't. And all of us who can see, will most likely never know if the colors of their world will be the same with others.

    So I hope this answer is able to make you feel relaxed and that you can finally fall asleep... :o)
    • Jul 11 2012: hi,
      thank you for comment.
      i thought again and again , but i couldnt solve the problem .
      but now i am sure about something that is "black". i am sure all of our blacks are the same. because we see nothing and call it black. black means no light as you know. And white is just like black, i think, isnt it a mixture of all colours.
      In addition to this, i found out a way to solve the question; but i am not sure it is the solution.
      in advance, i noticed something; when i lookt at the sky , i feel better and happier, and call it blue. when another person look at soil, he feels better and happier and call it brown. imagine a nameless colour , when i see it i feel some feeling and call it blue , and when another see it, feel the same feeling and call it brown. then it is the same colour but we call it different. it is the same because does the same effect on a human soul. so my blue is his brown.
      i dont feel exactly relax , but enough, i want to sleep anymore =) .
      please check that, and share with me your opinion , i will read it 8 hours later. =)
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        Lejan .

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        Jul 11 2012: Good morning, Ömer!

        I hope you slept well to face my comment on your latest discoveries :o)

        Black and white are not considered to be colors. Black as you noticed youself is the absence of color, whereas white contains them all and can therefore not be reduced to a single one. The white definition applies to active light colors only.

        Your comparative approach for blue and brown sounds interesting, yet would only work if these impression would always stay the same, which I haven't experienced so far.

        My impressions of 'brown' are related to the context I experience it. Let's say I would like it on a walk in the countyside, yet would really fear it in my last moment because my parachute didn't open. Same color - different context - opposite feelings. The same with a blue sky. It made me feel happy the day I forgot to put on my sunblocker cream, and the next day the same color makes me feel to avoid it, as I am in pain with my sunburn. Same color, same person and yet not comparable.

        Personally I would not consider this a valid concept to prove and compare the individual impression of colors, yet if it puts your mind on rest for a good sleep on a blue moon, then stick with it! :o)

        And try to avoid synaesthesia, as it becomes even more complicated by it. :o)
        • Jul 11 2012: Thank you.
          How an interesting experience and detection.
          I think we must wait until someone will invent a machiene which will be able to show my dreams, imaginations on a monitor.
          I hope someone can invent it soon, when it happen, I will find you , and i will imagine the blue color and the machiene show it to you, when you say: "Yes, it is the blue color, by me" , I feel really relax and happy ,
          I will sleep during hours =)
          Thank you very much again.
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    Jul 10 2012: No we don't all see in the same colours. Most people just see different shades of the same colour differently that's why you can argue with people as to whether turquoise is more blue or more green.
    But say we saw in completely different colours, yet from childhood as the teacher points to a colour chart and sad colour X is red, no matter how we perceive it or how it varies from person to person, that colour will forever be red to them. So like you say my red could be my green to you.
    As for testing for it, aside from testing for colourblindness I've no idea, there may be something to do with pigments/enzymes in the eye and laws of refraction and nerves etc but I'm not sure.
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    Jul 10 2012: You might enjoy Oliver Sacks' book Island of the Colorblind. It is a field study of a neurological comdition that affects the way the eye/brain processes color.