Re:The Difference Between ‘Violet’ and ‘Purple’ (2015)
by frosted-flakes on Tuesday April 02, 2019 @08:24AM
(#19553263)
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.
Re:The Difference Between ‘Violet’ and ‘Purple’ (2015)
by jobigoud on Tuesday April 02, 2019 @08:34AM
(#19553345)
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.
Re:The Difference Between ‘Violet’ and ‘Purple’ (2015)
by frosted-flakes on Tuesday April 02, 2019 @10:25AM
(#19554378)
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
Re:The Difference Between ‘Violet’ and ‘Purple’ (2015)
by OscarCunningham on Tuesday April 02, 2019 @03:24PM
(#19557704)
Lots of animals have the useful form of tetrachromacy though.
Re:The Difference Between ‘Violet’ and ‘Purple’ (2015)
by mcv on Tuesday April 02, 2019 @09:19AM
(#19553723)
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?
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.