What's the wavelength of pure blue?

Atomicrox · Sep 15, 2013

Not asking which one you like the most, I'm asking which one you think is the purest shade of blue (as in not skewed towards violet or cyan).

Of course very few people have seen all of these, feel free to interpolate or guess based on the ones you have actually seen.

Zeebit · Sep 15, 2013

I wish I could tell.

steve001 · Sep 15, 2013

The question doesn't make sense. It like asking what's more square than a square?
Spectral colors are as pure as they can be.

Not asking which one you like the most

You are asking for a judgement call which can't be objectively decided.

hwang21 · Sep 15, 2013

I couldn't say for sure, I'm going from 445nm to 473nm... not a good estimate

TheDukeAnumber1 · Sep 15, 2013

steve001 said:
The question doesn't make sense. It like asking what's more square than a square?
Spectral colors are as pure as the can be.

You are asking for a judgement call which can't be objectively decided.

It's a very simple question, you're making it more complicated than it needs to be. It's not scientific, he asking opinions of what we would say is true blue, the midpoint between green and cyan. What doesn't make sense about this?

Edit: My observation would be it's slightly below 445nm, unsure though.

Atomicrox · Sep 15, 2013

That's the point of asking here... It is a completely subjective question, therefore a lot of answers are needed to have an average of what WL people consider as a pure shade of blue.

By pure I don't mean saturated. I mean not skewed towards violet or cyan.

If you don't know the exact answer (and no one does) just make a guess

Blaster · Sep 15, 2013

Its not an objective question a famous scientist Sir Isaac Newton after years of study determined and. added the 7th colour to the rainbow indigo which is 445nm ..true blue is 460-465nm by all further analysis much later as technology advanced ..we all perceive color slightly different but as a frequency 460-465nm is blue not indigo ...( there's only so much you can get of Google lol)

hwang21 · Sep 15, 2013

Well isn't 460nm known as "blue"? Soo I guess my vote is 460nm

ZRaffleticket · Sep 15, 2013

I don't think I can say 450nm is more blue than 473nm. Both are blue, just different shades of blue.

It's the same as asking which apple tastes more like apple, green apple or red apple.

bloompyle · Sep 15, 2013

I have to say 475nm. When tuning down on the Omni, I get to 458, and it looks very violet. Although that's because I just compared it to everything above it, so I guess I can't answer without bias. Even 465 looks violet when tuning from green -> blue.

ARG · Sep 15, 2013

455nm is when I stop seeing purple, and 475nm is when I stop seeing green.
445nm looks purpleish (actual 445nm, not the 9mm diodes that are 450-455nm) and 480nm looks greenish.

Halfway between those two is 465nm. I imagine "pure" blue would be around that wavelength.

Atomicrox · Sep 15, 2013

Very interesting results so far! As I expected we are getting an average way above 440nm.

ARG · Sep 15, 2013

440nm is purple! I wouldn't even consider that to be blue

At times like this I wish I had a free electron laser to test this out

Atomicrox · Sep 15, 2013

Interestingly 440nm is what the WL to RGB algorithm considers as pure blue (0x0000FF). Of course that's further complicated by monitor calibration and so..

This is one of the main reasons I made this poll. If response is good we might get a better WL to RGB algorithm in the end!

Yeah, I would like to play with one of those XD

ixfd64 · Sep 15, 2013

I think the OP is asking about the shade of blue used in the RGB color model.

Atomicrox · Sep 15, 2013

Not exactly, I know RGB colors aren't monochromatic but I suppose what I'm asking is which wavelength each person idealizes as blue, out of our current monitor constraints

What's the wavelength of pure blue?

What's the wavelength of pure blue?

430nm

435nm

440nm

445nm

450nm

455nm

460nm

465nm

470nm

475nm

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