143
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
this post was submitted on 15 Jul 2023
143 points (98.0% liked)
No Stupid Questions
35311 readers
1935 users here now
No such thing. Ask away!
!nostupidquestions is a community dedicated to being helpful and answering each others' questions on various topics.
The rules for posting and commenting, besides the rules defined here for lemmy.world, are as follows:
Rules (interactive)
Rule 1- All posts must be legitimate questions. All post titles must include a question.
All posts must be legitimate questions, and all post titles must include a question. Questions that are joke or trolling questions, memes, song lyrics as title, etc. are not allowed here. See Rule 6 for all exceptions.
Rule 2- Your question subject cannot be illegal or NSFW material.
Your question subject cannot be illegal or NSFW material. You will be warned first, banned second.
Rule 3- Do not seek mental, medical and professional help here.
Do not seek mental, medical and professional help here. Breaking this rule will not get you or your post removed, but it will put you at risk, and possibly in danger.
Rule 4- No self promotion or upvote-farming of any kind.
That's it.
Rule 5- No baiting or sealioning or promoting an agenda.
Questions which, instead of being of an innocuous nature, are specifically intended (based on reports and in the opinion of our crack moderation team) to bait users into ideological wars on charged political topics will be removed and the authors warned - or banned - depending on severity.
Rule 6- Regarding META posts and joke questions.
Provided it is about the community itself, you may post non-question posts using the [META] tag on your post title.
On fridays, you are allowed to post meme and troll questions, on the condition that it's in text format only, and conforms with our other rules. These posts MUST include the [NSQ Friday] tag in their title.
If you post a serious question on friday and are looking only for legitimate answers, then please include the [Serious] tag on your post. Irrelevant replies will then be removed by moderators.
Rule 7- You can't intentionally annoy, mock, or harass other members.
If you intentionally annoy, mock, harass, or discriminate against any individual member, you will be removed.
Likewise, if you are a member, sympathiser or a resemblant of a movement that is known to largely hate, mock, discriminate against, and/or want to take lives of a group of people, and you were provably vocal about your hate, then you will be banned on sight.
Rule 8- All comments should try to stay relevant to their parent content.
Rule 9- Reposts from other platforms are not allowed.
Let everyone have their own content.
Rule 10- Majority of bots aren't allowed to participate here.
Credits
Our breathtaking icon was bestowed upon us by @Cevilia!
The greatest banner of all time: by @TheOneWithTheHair!
founded 1 year ago
MODERATORS
I'm confused...
Doesn't a rainbow contain all colours by definition?
It doesn't contain pink or brown. Some of the colours we see are how we register a mixture of light frequencies, whereas each point in the rainbow is just a single frequency.
What a phantastic thread!
We have had linguistics, sociology, physics and now biology in the form of colour perception so far.
Cross domain discussions are great! :-)
This is incredibly incorrect. While many colors that are additive are combinations, those combinations are simply approximations of the single wavelength true color. All colors are on a spectrum of hue, luminance (brightness) and intensity (saturation).
Pink is red with high luminance and high intensity, and brown is orange with low luminance and mid-high intensity
Nope. A whole bunch of colors do not correspond to any wavelength of light. This includes purple.
https://en.wikipedia.org/wiki/Spectral_color#Extra-spectral_colors
Pink can also be described as a reddish hue with high brightness and low saturation. But saturation is a matter of how strongly one frequency is emphasized compared to other frequencies. So colors with low saturation contain mixtures of frequencies, but each point in the rainbow, when there's no other source of light present, is only a single frequency. This is why the rainbow doesn't contain any desaturated colors like pink. Brown, I admit, can be just dark orange.
Well yes, but the differentiation of colors varies by, believe it or not, culture! For example, the Japanese word for blue, 青 (ao) was used both (depending on context) for what we would call blue and green, and it wasn’t until modern times that a new word, 緑 (midori) started being used to explicitly define what we might call green. Even now, their ‘green’ traffic lights would be described as blue in other cultures. My apologies for the euro-centric over-simplification, but here’s a great article to elaborate further: https://cotoacademy.com/japanese-color-blue-green-aoi-midori-青い-みどり/
Interesting point.
And I am a little bit with the Japanese in this regard. At least my GF always complains that I am unable to correctly distinguish between green and blue ;-)
There's a difference between linguistic simplicity and color blindness.
Well in my case it's more about where to draw the line between blue and green.
I can differentiate the colours but just still call things blue that my GF (and most of the rest of the world, apart from Japanese and the german dialect I grew up with as it seems) already calls green.
This is a running joke in my house. My daughters like to wear a lot of blue/green shirts. Apparently I always guess it wrong.
Finally, I am not the only one! Feels good.
Purple, or violet, is a bit shorter than 400 nanometers regarding its wavelength.
https://pixfeeds.com/images/7/308404/1200-308404-483872671.jpg
Actually....
There is no purple light.
Kinda.
Video explaining it in detail: https://youtu.be/CoLQF3cfxv0
Several colors we can perceive only exist as a specific mixture of wavelengths. And purple (coincidentally for this thread) is one such - white light contains it, sure, but, you can't isolate it to a specific single band, like you can isolate cyan or yellow. So, no, rainbows can not have purple in them.
I disagree. That color he keeps talking about is magenta, there is no magenta light. I see purple in the rainbow, but not magenta.
You would be half correct. Magenta is impossible "in the real world". It obviously exists on your computer screen due to its ability to shoot colored light into your eyeballs
Well yeah. I guess my question should be “why do we learn indigo and violet when we learn about the rainbow”. It’s more cultural
Yes, exactly.
E.g. in Germany I don't have heard anyone using Indigo and Purpur as major colours but only in combination with blue : "Purpurblau" and "Indigoblau" describing certain forms of blue.
So only blue and violet in german rainbows. And ultraviolet because most of us are more engineer than poet nowadays ;-)
You'd think so but colours are weird. Some of the ones we see aren't ones that actually exist, they're invented by our brains. Magenta for example doesn't exist, there is no wavelength for it and because of the way our eyes detect light it should really be a shade of green. But our brain doesn't like that and invents a brand new colour instead.