I used GIMP to maximally saturate the colours: https://i.imgur.com/wfyEWcP.png

Does the purple still look more blue than the violet?

Hmmm, no I guess not. If I didn't know I'd just label both as blue.

As others are pointing out, it's worth remembering our monitors aren't necessarily even capable of producing true violet. And I'd add that monitors vary widely in quality themselves. This one I'm typing on doesn't yell to me "piece of crap", because I mostly do coding-type activities on it and it's plenty fine to do syntax highlighting, but sometimes when the rotating desktop background shows the same one on this monitor and the built-in Macbook monitor, it's like, huh, there's a lot of difference there. It really wouldn't be a great monitor to watch media on routinely.

We aren't even all looking at the same colors in the first place.

Yeah I get the same impression, it's just that I don't think I could recognise those as Purple and Violet even in non-oversaturated form, to me it's all just different nameless hues of blue.

I'm not so sure about that. The left side appears _overwhelmingly_ purple, and the right side looks _very_ blue. Have you tried something like the Farnsworth-Munsell 100 hue test?

Thanks, that was an interesting test. I guess my feeling of "I'm slightly colourblind" is correct. I don't seem to have that many problems with blue though.

My results: https://imgur.com/a/0AvU4hX

Does anyone know what colourblindness really is? My guess would be that it's one (or more) of the cones either not working properly, or working differently, creating a very different colour experience.

For example, looking at the graph in the article, I'd expect that if your green cones don't work, you'd see no real difference between green and red. If your blue cones don't work, blue would look slightly red. If red cones don't work, again red and green are roughly the same, but violet would look blue.

But that's entirely my uneducated guess as a complete layman on the subject.

As for the purple and violet in the picture, that violet can never be true violet because it mixed by your computer screen from RGB colours, so it's really created by mixing more blue with red, and probably a bit more green, since it's a lighter colour (adding more of the least represented colour moves it closer to white I think).

So if that looks more red to you than the equally mixed purple, the only explanation I can think of is that it might come from the added green, which your eyes might register as potentially red if it's your red cones that don't work properly.

But again, pure guesswork on my part.

We know exactly how colour blindness works. Usually, the cones all work, but the range of wavelengths they can detect is slightly shifted from normal. Red-green/green-red colour blindness is the most common, and in that case the range of wavelengths that the red and green cones can detect overlaps more than they usually do.

That's how I understand it anyway.

And that's how we are all colorblind compared to tetrachromats. They have four cone types that don't overlap.

I wish in the future there will be a procedure where you can have cone cells injected to unlock these new colors.

That's not true, actually. Tetrachromats see the same range of electromagnetic wavelengths as everyone else—there's just an extra cone in there that's mostly useless. There's a great video on YouTube called Tetrachromats Don't Have Superpowers that explains it quite well: https://youtu.be/fDoAs0qN7lU

Lots of animals have the useful form of tetrachromacy though.

Would we be able to interpret those colours? How will our brain handle and interpret them? It might be like having to learn to see all over again.

It's certainly a cool idea, though. And you don't have to stop at four. Don't butterflies have 6 different cones or something?

Violet in the article is not a real violet. A computer screen shows violet as a mix of red, green and blue as all colors. So the violet in the article is really a blueish purple. Also many file formats encode them as such. That's only an approximation.

My understanding of color blindness has always been that it's typically a problem with the actual eye cones for color sensing--at least for non-pathological cases of color blindness.

Color blind / dichromat here: They're pretty much all shades of blue to me.