Color (North American English), or colour (Commonwealth English), is the characteristic of visual perception described through color categories, with names such as red, orange, yellow, green, blue, or purple. This perception of color derives from the stimulation of photoreceptor cells (in particular cone cells in the human eye and other vertebrate eyes) by electromagnetic radiation (in the visible spectrum in the case of humans). Color categories and physical specifications of color are associated with objects through the wavelengths of the light that is reflected from them and their intensities. This reflection is governed by the object's physical properties such as light absorption, emission spectra, etc.
By defining a color space, colors can be identified numerically by coordinates, which in 1931 were also named in global agreement with internationally agreed color names like mentioned above (red, orange, etc.) by the International Commission on Illumination. The RGB color space for instance is a color space corresponding to human trichromacy and to the three cone cell types that respond to three bands of light: long wavelengths, peaking near 564–580 nm (red); medium-wavelength, peaking near 534–545 nm (green); and short-wavelength light, near 420–440 nm (blue). There may also be more than three color dimensions in other color spaces, such as in the CMYK color model, wherein one of the dimensions relates to a color's colorfulness).
The photo-receptivity of the "eyes" of other species also varies considerably from that of humans and so results in correspondingly different color perceptions that cannot readily be compared to one another. Honey bees and bumblebees have trichromatic color vision sensitive to ultraviolet but insensitive to red. Papilio butterflies possess six types of photoreceptors and may have pentachromatic vision. The most complex color vision system in the animal kingdom has been found in stomatopods (such as the mantis shrimp) with up to 12 spectral receptor types thought to work as multiple dichromatic units.The science of color is sometimes called chromatics, colorimetry, or simply color science. It includes the study of the perception of color by the human eye and brain, the origin of color in materials, color theory in art, and the physics of electromagnetic radiation in the visible range (that is, what is commonly referred to simply as light).
If differing wavelengths explain color variations, would not the longer "zig-zags" of the separate colors for the bluer spectrum portions of visible light suggest that they have traveled longer to get to a discrete point from that of their origin? - Assuming that the component colors of...
I'm trying to carry out a color blindess test for a biology project. My friend, who is color blind, will help.. but I'm wondering what kind of tets I could use (besides the Ishiraha test).
I'm thinking having two pictures displayed.. and then brining down the "hue" color of a single color in...
I have no doubts that the eye colors of infants can change during the first several months of life. I've got my own proof in my sibling's (and my own) baby pictures. But what about years later, like adolescence or even adulthood?
I know people who say their eye colors change depending on...
From http://arxiv.org/abs/hep-ph/0510086
With SUSY space-time shift and with infinite color potential I tried to explain the initial energy density of Big Bang; need to discuss.
1.Quark confinement
We can’t see free quark, because it forbid the antiscreening and quark confinement.
The...
The reply box is a funky grey-ish color. actually it's not funky at all. I think I liked the old one better.
Aside from that what's changed? I havn't noticed anything yet...
I like some colors and you may be some other. But is it possible that you and me are liking the same colors, but have different names fot it.
The wavlength that produces a sensation of red color in my brain, is producing the sensation of green color in yours and that which produces red in you...
I had a thought the other day - following from general relativity, a photon experiences a gravitational red shift in frequency. Searching for a research project, I toyed with the idea of a chromodynamic red shift if a photon were to pass through a strong field. However, since the photon has no...
Do you know why people say, the white, the black, the yellow... ?
What about people who is not white, not yellow, not black ?
I know sunlight can burn ou skin to bright black. Why some people's heads are pink like just using some cosmetics ?
Thanks
here is a question that i am having trouble with for my math class:
Three players enter a room and a red or blue hat is placed on each person’s head. The color of each hat is determined by independent coin tosses. Each person can see the other player’s hats but not his/her own. No...
Last evening there was the perfect rainbow condition: A bright evening sun shining into a rainstorm just overhead. I went outside to see both complete arcs from horizon to horizon . THen...
the inner rainbow (the most commonly seen rainbow, with red on the outside of the bow) looked odd...
Hi all,
I'm just curious what you see on these testimages:
http://www.toledo-bend.com/colorblind/Ishihara.html
http://en.wikipedia.org/wiki/Color_blindness
When I was in school, our biology teacher asked us what we see
and there were 2 out of 24 pupils who couldn't see the red 8.
I...
I'm not sure if this is the right forum for it, but I had a few questions about how color vision works. I know that mixtures of pure colors look like other pure colors. For example, some mixture of pure (monochromatic) green and blue looks like pure yellow. So for a given color, are there an...
Gene Therapy
Can you use gene therapy to change eye color (or something other than that to permanently change eye color) or is gene therapy not available for that yet?
I a have a broad background in chemistry so I know the basics. I was looking at a tanning product and this was the guy's big claim "All these ingredients have high pH levels of over 6! What does this mean? A pH of over 6 is the COLOR ORANGE!" Now, I wasn't aware that pH could change the color of...
I have two aqueous solutions---Fe(III)(NO3)3 and KSCN (no precipitate in either, both are fully dissociated into ions). I react five drops of the ferric nitrate solution with one drop of KSCN (assume that we end up with excess Fe[3+])
The net ionic reaction Fe[3+] + SCN[-] (equilibrium...
At the risk of being flamed, I am going to throw this into the arena for discussion, for the issue seriously concerns me, so here goes. First to qualify:
I am a white Australian of 44. I have traveled the world extensively always as a backpacker. This keeps my feet firmly on the ground and is a...
OK, I know this is a stupid question, but I just plainly forgot how to decode the value of the resistance of standard resistors from the color coding. I know the last band is soemthing to do with tolerance of the resistance values, but what is the value of the tolerance related to a certain...
Color Temperature Difference between eyes??
My right eye views color temperature than the left. One eye open at a time then switching shows a difference. When both eyes are open my viewing image looks even and nice. Whats the deal with that anyhow? Anybody else have that same issue? well...
I was reading somewhere that the because of the red shift it can be concluded that the galaxies are moving away from us. But still when we talk about stars, red color refers to cooler stars rather than stars moving away from us.
Why?
It it isn't a false color image of the sun, then how are we able to look at it this way if the sun is so bright? Wouldn't it just be a picture of bright light?
http://www.1spacewallpaper.com/sun-wallpaper/Sun-pictures_1024.htm
Ty
Ok, a man lives in a one story house with no poarch or basement, If the walls are green, the coach is green, the lamp is green and the ceiling is green what color are the stairs?
Can anyone give me a fairly brief explanation of how liquid color displays work, and why they display color, instead of just a lightened color for charged areas, and black for uncharged areas.
Lastly, I've no idea why these devices display color, what the liquid is composed of, what physical...
I woould like to know what determines our hair color ? Its not only on my head, but even on my face, chin-cheeks (beard), my arms, my body, that that color is is not brown, there are quite a lot of (yellow+red=orange) hairs growing. I was born to have brown hair, differing from my parents and...
hey, I am a bit confused about the forces. if there's four of them, where does color fit in? the hyper-physics website says that the strong force is a 'residual color fource'... but see the thing is, it also says the force-carrying boson is the pion, while the gluon carries the color force...
Hair color -- Curiousity
i have just learned from my biology class that Sulfur plays an important role hair structure, but I am still looking for (an) answers to what makes people's hair colors different.
By the way, can you tell me as to why black people have different hair style - so black...
Just a small question: If the wavelength of light changes in a denser medium then why don't we percieve color red as some other color? :eek:
Also, why does only wavelength changes not the frequency but not the vice versa? What determines this?
Okay, so a hunter gets out of his cabin on morning and gets into his jet powered surface cruiser. He travels 4000 miles south; turns eastward and travels 4000 miles and finally turns north and cruises for 4000 miles, at the end of which he is back outside his cabin. Now he sees a bear standing...
In this glaciated upland region why is the the river or lake a green colour? Me thinks that it is obviously to do with the sediment on the bed of the lake. Perhaps it is a chalk bed or a solution lake?
From the book Color by Paul Zelanski & Mary Pat Fisher:
"A final limitation of scientific theorizing on the artist's use of color perception is the fact that many of us percieve colors through senses other than our vision. The ability to feel colors with our hands is not uncommon among blind...
Pleeze, folks, don't ever forgit, the most important question you can ever ask is, "What color is it?" It doesn't mattur what the topik if conversayshun is, just ask whoever you are talkin with, "what color is it?", and watch their expresshun. Its fun. Makes for interestin talk. Want to...
In the theory of everything section of the MKaku forum, I asked Nereid about the physiology of color, especially the bands detected by the cones, and she responded as follows:
Some sources for colours and bands, in general (probably gives you more than what you asked for) ...
Color, like beauty, is intrinsic. IMO
The usual reductionist thinking is that color is assigned by our minds according to the frequency of the light sensed. Light does not contain or carry the property or value of color but rather has frequency, wavelength or energy level that we perceive...
I read that the most common form of color blindess (red/green), occurs in 7% of males, but only in .4% of females.
Men just have to get the gene from their mother to have color blindess. But women have to get it from their father also. So shouldn't that make it only half as likely for females...
can someone help me??
i have been having an argument with my cousin about which color stars produce more heat?
i say that blue stars produce more heat!
but my cousin says that white stars produce more heat!
can someone please tell me if I'm right or if she is right?
Anyone knows any good websites, books, resources for information about how the color of a laser might affect the velocity og the light wave projected by the laser ?
Any help is appreciated.
I have about a lot of questions. and i did around 85% of the work. the other questions i had to leave blank because they were quite confusing and pretty hard for me. These are quite alot..answer what u may wish.. (If No One Wanna Help Thanks Anyways Just don't get mad at me) :)
1. a) Do...
There was a line of debate that was started in the old PFs, but it was never finished, and I'd like very much to continue it.
The following is the conversation:
You see, I would reply that all Alexander did was give the Scientific labeling of that which we percieve (color).
From the thread, The USA is God:
A source of universal information? Hmm... In other words the mind is like a receptacle, "or door," to another dimension?
"After this I looked, and, behold, a door was opened in heaven: and the first voice which I heard was as it were of a trumpet talking...