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d_r0ck t1_iu0w80n wrote

420 is not green. My disappointment is immeasurable and my day is ruined

123

dalens t1_iu0xhi0 wrote

Uhm. It doesn't do the job. Also the 488 nm is too much cyan. The argon laser and the diode at that wavelength are more blue.

31

Theskyis256k t1_iu113ad wrote

666 is full on red.

Coincidence?!?!?!

273

Thanatomanic t1_iu15xpx wrote

This is not how it works. Most monochromatic colors fall way outside the color gamut of a typical display, and are therefore impossible to show accurately.

For example, see this image: https://upload.wikimedia.org/wikipedia/commons/thumb/9/91/SRGB_chromaticity_CIE1931.svg/440px-SRGB_chromaticity_CIE1931.svg.png Your phone can probably show you all colors within the triangle. But monochromatic light traces the outline of the weird shape.

116

TwistingTrapeze t1_iu16w8s wrote

It's a cute idea... But ultimately I don't like it. First color I tried was 632 and it looked way way too orange. I know the color science and the gamut considerations and the dominant wavelength considerations, but it just doesn't seem to make a very good representation when it comes down to it. There's ways to perceptually change the gamut to make it look better, but this is one of those things where you just need a grating and a tungsten lamp

4

koolman2 t1_iu17avh wrote

Before you do this, turn off any screen-adjustment settings like night mode or TrueTone. These will change how they look.

3

rubseb t1_iu185m4 wrote

This is useless in so many ways, but perhaps the most profound way that it is useless is that I already have goddamn eyes to tell me what color a wavelength of light is.

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xoforoct t1_iu1fb16 wrote

Flow cytometry gang rise up

7

ScreamapillarAPI t1_iu1fpxp wrote

Replying to [deleted] (#267,161)

The base 10 number system wasn't universal for human civilization and certainly wasn't the first numeric system developed by humans. The sumerians used a base 60 counting system which they passed on to the Babylonians, which is why we we still measure our time and things like angles and coordinates in geometry by factors of 60. (Eg 60 seconds in a minute 60 minutes in an hour)

It originated by using our thumb to point to the 3 bones of our fingers, times that by 4 you get 12, times that by 5 fingers per batch of 12 and you get 60. (That last step at the end confuses me because it seems to contradict using your thumb to point to your 4 fingers but that's what the wiki seems to say)

https://en.m.wikipedia.org/wiki/Sexagesimal

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WillBigly t1_iu1jgpl wrote

What do you mean you don't know what 800nm light looks like?

1

Valmond t1_iu1kg1w wrote

Gotta caliber your screen first, and then check if it can actually show the color chosen.

Screens have come a long way but there is a reason why expensive screens cost more.

1

Any_1ove t1_iu1mrv2 wrote

Okay the color should be super accurate right? I put in 589nm and it looked much yellower that I remembered (sodium spectrum, I had the impression they are orange.)

0

get_Ricked t1_iu1o6ea wrote

It's broken. 420 isn't green.

2

curly_spork t1_iu1oeqn wrote

I've been increasing the frequency by one and haven't noticed any changes!

4

mawktheone t1_iu1v4tw wrote

Replying to rubseb (#266,487)

So without looking if you're buying LEDs and they're listed as 452nm do you know what is?

Or if you're trying to match a product that already has lights, can you tell the shop what shade you need?

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SurrealRareAvis t1_iu29mot wrote

Cool, thank you!

(Burnt Orange birthday girl, me …)

2

RisingPhoenix5 t1_iu2jfu6 wrote

Replying to ScreamapillarAPI (#267,562)

So essentially, your dominant hand would count up to twelve using the bones on your fingers of that same hand.

On the other hand (This entire comment is worth it for that pun), your non-dominant hand would count the number of times you reached 12 while counting, or the multiple of 12 to use. So two fingers on the offhand would be equivalent to 24, while three of the offhand and 3 bones on the dominant hand would be 2(12)+3 = 27.

At least, that was my understanding from the Wikipedia page.

9

Vreejack t1_iu2lldw wrote

Replying to Thanatomanic (#266,188)

One obvious flaw is that--for example--pure blue is 440nm, and you get that on the display by showing only bright blue pixels with no red or green. It is impossible to show a bluer color than that on your RGB display. Anything to the left of that on the chart would be "bluer", meaning it has even less green and red than 440 does, but you are already at the limit of the display, which demarcates the limit of you monitor's color gamut. Adding red in, as the chart does, makes no sense.

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ScreamapillarAPI t1_iu30g51 wrote

Replying to RisingPhoenix5 (#273,897)

Doesn't that describe a base 12 system though rather than a base 60, if your off hand represents X * 12? Like in base 10, eleven is represented as 11. (1 * 10 + 1) and in base 2 11 is three (1 * 2 + 1)

Edit: I found a video by numberphile explaining base 60 and he describes it exactly like you did. I guess what I'm hung up on is why is it considered base 60 rather than base 12? https://youtu.be/R9m2jck1f90

3

dxin t1_iu3651k wrote

The funny thing is, non of these colors could be accurately displayed on any digital device.

1

RisingPhoenix5 t1_iu36q32 wrote

Replying to [deleted] (#276,916)

As noted in other comments and the wiki I commented on, it is actually a base 60, not 12. 12 is just the number of digits you can count to on one hand. In the same way the base 10 system works off of both hands, just using a different base.

1

TheThiefMaster t1_iu3dt5n wrote

Replying to ScreamapillarAPI (#276,531)

It's because it goes to 12 on one hand, then 5 on the other, and then if you go higher it does 12 again then 5 again. You can think of that as going to 60 on both hands, then 60 again, rather than alternating 12 and 5.

e.g. 12×5 (60) seconds, then 12×5 (60) minutes, then 12 hours

Really it's an alternating base 12/5 number system though.

1

Thanatomanic t1_iu3kain wrote

Replying to [deleted] (#279,143)

Even with sRGB as default and a well-calibrated display, the choice of gamut transformation determines the hue that you get on your display in comparison with the monochromatic light. It's really not clear cut.

1

TossAway35626 t1_iu3l1a9 wrote

Replying to [deleted] (#278,775)

Fun fact, its only due to a weird quirk of biology, an imperfection, that red and blue make purple. Were it not for this we would have a completely different color wheel.

The cone that picks up red also picks up just a bit of violet. So if something triggers both our red and blue rods, it must be purple. Our eyes cannot tell the difference between a single wavelength triggering red and blue and 2 wavelengths triggering red and blue, it sends the same purple signal to our brain either way.

6

Vuhmahnt t1_iu3lstn wrote

What's your favorite color?

Me from now on: "510nm"

1

RoastedRhino t1_iu3viy6 wrote

Replying to Thanatomanic (#266,188)

Well, it's pretty clear that if my monitor has three leds, each one emitting light at different frequencies, the only thing that they can produce is the sum of lights at those frequencies, not another frequency.

And viceversa: there are colors that come from mixtures of frequencies and you cannot have with one frequency (purple).

Having said that, we only have three types of receptors, and it is possible to match the response of those as good as possible.

1

SiggyThePiggy t1_iu462tc wrote

I challenge you to find the wavelength of brown

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TossAway35626 t1_iu55mg9 wrote

Replying to [deleted] (#279,296)

I do not remember that comment, I should stop redditing before bed.

I feel describing cones by the colors they pick up makes it easier for people to understand. Not sure what was going through my head when I said rods though, I referred to them correctly earlier in the comment.

I would actually like to see monochromatic violet next to red and blue to see if there's an actual difference. Its not exactly possible to imitate this experiment with a screen.

1

HawkinsT t1_iu8dsq4 wrote

Starts getting very cool around 379 nm.

1