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FutureStarrWhat does violet look like
However, as you can see from the picture above, no spectral colour activates the “blue” path and the “red” path at the ratio of 1:1 without also stimulating the “green” path. In other words purple is not a spectral colour. You can have a source of monochromatic violet light (i.e. a source producing just a single wavelength), but everything that looks purple must emit both red and blue light.
If you take a look at the distance between violet and blue in the picture of the spectrum above, it is about the same as the distance between green and orange. Purple is a mixture of red (which is at the opposite side of the spectrum than violet) and blue (which is relatively far from violet), so it is, in terms of wavelengths, a completely different colour. Look at the picture above – on the left side is purple and on the right side violet colour. Not that different right? Even though purple seems a bit more radiant and reddish. On the picture bellow you can see some shades of purple (left) and violet (right). Purple again goes more to red and violet seems to have more blueish hues. Both of these colours are placed between blue and red on the traditional colour wheel. There purple occupies space closer to red and crimson, whereas violet is closer to blue and generally less intense. However, there is more to it.
What about purple? Well as mentioned before some colours are basically just a mixture of different wavelengths. Usually everything we see is not made from spectral colours but a mixture of different wavelengths. And we are exceptionally good at differentiating between these mixtures. Heck we can see millions of colours! Purple is generally a mixture of blue and red with ratio 1:1. However, if you look at the scheme above there is no such spectral colour that activates “red” and “blue” cones in such ratio, without stimulating the green pathway as well. Thus, purple is not a spectral colour but a mixture of spectral colours (like white!).So, in summary – even though purple and violet look just a tad different to humans, they are actually very different. Violet is a spectral colour, whereas purple is the mixture of blue and red wavelengths in ratio 1:1. The reason we perceive both colours as very similar is due to the morphology of our cones and the way we process input signals. However, different animals have different cones and thus, may perceive these two colours as completely different! This kind of shakes our perception of the world and what we think of as real. It really depends only on how you look at things! (Source: steemit.com)