Le violet est une «couleur non spectrale», ce qui signifie qu'il n'existe que dans notre esprit: il n'y a pas de longueur d'onde de lumière qui lui correspond. Notre cerveau perçoit le violet lorsqu'il voit un mélange de lumière rouge et bleue forte, sans aucun vert.

Perception des couleurs

Les propriétés de la couleur qui sont intrinsèquement distinguables par l'œil humain sont la teinte, la saturation et la luminosité. Alors que nous savons que les couleurs spectrales peuvent être corrélées un à un avec la longueur d'onde de la lumière, la perception de la lumière à plusieurs longueurs d'onde est plus compliquée. On constate que de nombreuses combinaisons différentes de longueurs d'onde lumineuses peuvent produire la même perception de la couleur. Cela peut être mis en perspective avec le diagramme de chromaticité CIE.

Le point E blanc ou achromatique peut également être obtenu avec de nombreux mélanges de lumière différents, par exemple avec des couleurs complémentaires. Si vous avez deux sources d'éclairage qui semblent être également blanches, elles peuvent être obtenues en ajoutant deux combinaisons de couleurs distinctes. Cela implique que … Continuer la lecture (lecture de 2 minutes)

11 thoughts on “Purple is a “non-spectral color”, which means that it exists only in our minds: there is no wavelength of light that corresponds to it. Our brain perceives purple when it sees a mixture of strong red and strong blue light, without any green.”

  1. Retrosonic82

    The same goes for a specific shade of pink, it was used in the film “colour out of space” for that very reason. It also happens to be my favourite colour. I do wonder if maybe people see that shade of pink differently to how I see it and it blows my mind knowing that it doesn’t actually exist!

  2. Zondartul

    That depends on what you mean by “color”. If we go by “color you perceive” then all color is only in our minds. To us, purple, pink, and violet are all shades of each other.
    If, on the other hand, we go by “color as wavelength”, then violet light is of a single wavelength while purple has two wavelengths, but our eyes have no way to differentiate between the two so purple and violet light are literally identical to our eyes.

  3. Pun-Nisher

    Strong Red and Blue Rain is my favorite Prince song.

  4. Username_Shusername

    So what’s with the V in ROYGBIV?

  5. Fake_William_Shatner

    This is pretty cool to know that you can have a purple color as a mix and as a unique frequency — TWO very different wavelengths.

    So it is EITHER an interpreted value or an actual value because our brain lacks another color or didn’t need one in order for us to understand what we were seeing.

    If we could see X-Rays, what color would they be? Maybe your brain would make understand it with another sense like hearing. If our eyes had perfect detection, we would see a gradation of lower to higher frequencies, maybe we’d be seeing in black and white.

    However, light is created by electrons dropping from higher to lower atomic orbitals and releasing energy in the process — so their are ONLY specific pulses that can occur based on atomic structure. Now of course, different atoms together, different surfaces, different speeds causing red-shift and such mean these specific bands are intermixed.

    So, it’s likely the different cones were even more specialized at one time, and saw narrower bands important to acquiring food and avoiding predators.

    Now if the I had a perfect single detector, we could differentiate these, but organically, it just worked out that it specialized into rods for luminescence three different cones as a primitive interferometer that and and Color is a concept.

    If you scrape off the outer layer of the eye and reduce it’s UV coating, you might actually see ultraviolet. Most insects “see” in this range. But what color it is – no telling. We can’t really imagine another color because our brains aren’t wired for it. I can “feel” another color though as a way to imagine it. We have the capability to use one sense to describe something “out of range.” People losing a sense or who have synesthesia do this “trick.”

    But the blue-red, and violet colors are where this trick was perfected and humans never noticed. I’d love to see an exact purple as red and blue, and also as the specific color source right next to each other to see if I can train myself to tell a difference.

    It’s really cool to understand our blind spots and how our brains mask them.

  6. _try_another

    I just found out I’m color blind. It came completely out of the purple!

  7. 7FigureMarketer

    So it’s just a pigment of my imagination?

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