2:50 - Four hour exposure? Seriously? Surely, ten minutes in the darkest of nights would overexpose any image unless you used a really narrow aperture (and possibly even then)?

*art

Adding video to channels (Art) - requested by Trancecoach.

Tags for this video have been changed from 'yellow, lemon, light, wavelength, look, eye, brain, retina, pixel, yellow, green' to 'yellow, lemon, light, wavelength, look, eye, brain, retina, pixel, yellow, green, vsauce' - edited by lucky760

Makes me think... how do we know chicken tastes like chicken?

Anyone got a link to that XKCD graphic?

but colour is an invention of our brains anyway? Is yellow a specific wavelength or is yellow what our brain says is yellow whether its red+green together, or "true" yellow.

>> ^Jinx:

but colour is an invention of our brains anyway? Is yellow a specific wavelength or is yellow what our brain says is yellow whether its red+green together, or "true" yellow.


Either way the light output by your monitor is not 580nm like your brain is telling you but rather an even mix of 650nm and 510nm.

If our eyes didn't "fudge" colors in this way we most likely wouldn't have color television (or monitors)

2043 will be a great year

If you like that Tang Yao Hoong's style of art, check out his master, Belgian surrealist René Magritte.

Oh, and *promote, for good measure.

Promoting this video back to the front page; last published Monday, September 3rd, 2012 5:16am PDT - promote requested by hpqp.

>> ^NaMeCaF:

Anyone got a link to that XKCD graphic?


http://www.xkcd.com/1093/

>> ^WaterDweller:

2:50 - Four hour exposure? Seriously? Surely, ten minutes in the darkest of nights would overexpose any image unless you used a really narrow aperture (and possibly even then)?


I wish. Night time photography would be a hell of a lot easier if this were true.

It's not. Four hours on a dark night seems reasonable to me. Depends on the camera settings used, of course, but if you keep the ISO low and use a reasonable aperture for good depth of field four hours sounds reasonable. The main problem with this is sensor bloom from the heat of the batteries and circuit boards in the camera itself.

If looks yellow, then it is yellow.

C'est ce n'est pas jaune.

I'm watching this on a Sharp AQUOS, and it does indeed have a yellow pixel sir.

So there.

>> ^fritzo9602:

I'm watching this on a Sharp AQUOS, and it does indeed have a yellow pixel sir.
So there.


Oh shit. I had forgotten about that model. Send the vsauce people a message!

>> ^braschlosan:

>> ^Jinx:
but colour is an invention of our brains anyway? Is yellow a specific wavelength or is yellow what our brain says is yellow whether its red+green together, or "true" yellow.

Either way the light output by your monitor is not 580nm like your brain is telling you but rather an even mix of 650nm and 510nm.
If our eyes didn't "fudge" colors in this way we most likely wouldn't have color television (or monitors)


I didn't read his post like that, maybe he's asking for a definition of yellow because as our cones are basically wavelength filters for photons whilst our brain interprets a message of "hey i caught something of this intensity" from each of them, what is this "yellow" that we all use and think we know what it means? It will eventually come down to the resolution of the eye; each photon from each source will be coming in from a different angle into our eye, by extremely small amounts - the smallest thing we can resolve is where our brain says "ok, i think that's coming from the same place; it's not red and blue separately but yellow."

It'd be the same if you have a green and red patterned circular board and spun it really fast. Our eyes effectively have a "framerate", a point where we see something as motion. Play a game and limit to 1 fps, then increase in say 5's and before 30 you should start to feel motion rather than stuttering frames, then as you keep going you can't see stuttering anymore, it's just all motion. Our eyes have something similar, we used to do it in science. My dad was head of physics and he stuck a ROYGBIV patterned board on a black and decker drill and when it was up to speed it looked white.

So if something registers as yellow to our brains, is that not yellow? We have no direct access to our cones, we just interpret the signals. If all we had were light sensitive cells everything would be one colour and no colour at the same time.

That's what the post meant to me and it's a great point really even if it's just an excuse for sciencey discussion! If yellow is defined as a range of wavelengths of light, he's right to say it isn't yellow, but i doubt many people think of yellow in that sense. Having said all that, the video was actually interesting and informative and i enjoyed watching it, and this is probably a philosophical question for others to bother with.

PS.
Bert and Ernie, Simpsons, Smurfs, South Park, Turtles? Not sure about B&E though.

This Is Only Red has been added as a related post - related requested by seltar on that post.