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).
I want to make a 2D plot of points with different x, y coordinates and have colors depending on a separate variable. I have make column vectors for x and y coordinates and another column containing 1 or -1. I would like to represent the points with 1 as red and -1 as blue points. I have codes as...
Homework Statement
Simple question we have to answer:
(Physics) How do I release the electrons from the cathode with a color filter? (The so called
Photoelectric effect)Homework Equations
none
The Attempt at a Solution[/B]
Here we have a conflict , the so called wave-particle duality, if...
I'm looking for the distribution of all wavelengths (or frequencies) of light that a stationary observer would receive at his location (at ##r = 0## and time ##t_0##), from all light sources emitting a single wavelength ##\lambda_{\text{e}}## (or angular frequency ##\omega_{\text{e}}##). The...
I was walking outside this morning and saw an interesting color effect in the ground cover. Parts of some leaves were illuminated by the sun and looked as expected (left side of image) but when I walked a bit further down and looked back the illuminated areas appeared pinkish (right side of...
I work in a factory where we package pharmaceuticals. There are quiet a few products that are light sensitive to a certain wavelength. The lights in the older buildings are fluorescent and were have defined wavelength specification. The wavelength determined the color light/filters set in the...
So I'm studying scattering and size parameters now, I've come to understand that the sky is blue because the size parameter is such that it's an excellent "scatterer" of blue-violet visible light, and horrible at red-orange, that let's pass, and such the sun is yellow within the Earth.
I've also...
Hi,
I was wondering if someone could help me change the color of table check box labels when my HTML file is loaded. At run time, I load a JSON file with color data for each branch of a function I'm plotting via WebGL and display a table of check boxes one for each function branch (there can...
If I take a standard blue Sharpie pen and write on matte white paper, the ink appears blue as expected, as shown in (a) of the attached photo. If I write with this pen on black plastic, it appears orange (b) in incandescent, fluorescent or daylight illumination and for specular and non-specular...
I'm trying to render the sky as it would appear from a starship moving at some large part of the speed of light.
Geometry was straightforward, but colors are the problem.
How would the doppler effect change the color of a star?
The expectation is that the stars behind are red and the ones ahead...
There are lots of amazing photographs of nebula around. The colors contribute greatly to their grandeur.
But if we were able to get near enough to a nebula to see it with the naked eye would it possesses the colors we see in published photographs taken by telescopes? Or are the colors in astro...
1. Is the color force the same as the strong nuclear force? I've heard that they're identical but I've also heard that the strong force is a "residual effect" of the color force. Not sure what to make of that
2. This is the more important question: if Gravity is "monopolar" and EMism is...
Hello Forum,
Awhite background reflects all colors (i.e. all incident wavelengths). A black screen, being black, absorbs all incident types of light (i.e. absorbs all incident wavelengths).
a)Let's consider a red monochromatic beam projected on a black screen inside a dark room. Would the...
Hi, just curious. I am trying to fix my Vaio PC , model PCG -71318L. Intially, PC worked well for a few minutes but eventually froze.
I thought it may be a hardrive thing . The computer had been on uninterruptedly for a long time, so I turned it off to "let it rest". After an hour or so, I...
Suppose the color of some elements is red and blue but after the reaction between them a new compound formed with yellow color .so on what factor does the the color of compound depend?
I think it may depend depend upon the number of electron transferred and the remaining one...
Hello,
I have read that blue fluorescent dyes do not exist. Why?
Optical brighteners do convert UV into blue light but a piece of plastic containing optical brightener dyes appears clear and transparent instead of blue? Why?
Does the color of the substance not correspond with the fluorescent...
I used a function called ind2patch to make a big 3D block which contains a number of smaller blocks in 3 dimensions. Each small block has a value which the magnitude is represented by a color.One example is shown below:
However, most of the boxes have very low or zero value and I don't need to...
Hello friends, I'm discussing here with a guy about how we see color and stuff... he claimed two suspicious things and I want to ask you If it is true and If there is evidence of what he said... claim 1 and 2...
I'm talking evidence, not hypothesis...can anyone help me here?
just remembering...
I'm redesigning a board game toy now.
The first version use color flaps rotated by shaft to show color, red or blue, and it uses 7 segment LED to display a single digit of player score.
I'm thinking of replacing the color flap with red and blue LED or other means to show these 2 colors.
But...
So today I was thinking that color is connected with a given wavelength (for example red light in air is about 600nm) but after some research online I found out that color depends on the frequency and when light travels through various optical media (like air, glass etc) speed and wavelength...
if "color" is one of the eigenvalues, how may a single gluon be in possession of 2 of them and still be unique?
also, a 2-color gluon is reminiscent of a 2-color tao, no?
I have a picture which shows the magnitude of some value in terms of color, like this one:
https://www.dropbox.com/s/yoh0n9cqftvrtlz/bar.jpg?dl=0
The higher the magnitude, the more it looks red. However there are only a few points at the edge has very high values and most of the points have...
Background: Normal white Sun light has a continuous spectrum in the whole of visible range. But, white light (rather what we perceive as white) coming out of a Monitor/TV is have only RGB in it and
it looks white because of the Tricolor vision which excites all three types of cells in the eye...
Question:
How many different pinwheels with 8 identically shaped pins are there if each pin can be colored one of 4 different colors?
My answer:
4^8 because each pin has 4 choices Is this correct? I think this only includes rotational symmetries. Do I need to consider reflectional symmetries...
It is a matter of fact that the perception of the yellow color occurs when the red and green sensitive-cones in human eyes are stimulated. I am interested to know whether this perception of the yellow color at the level of the brain happens instantaneously once the relevant parts of the brain...
There are different colors of light that I have heard about but when I asked this question to my physics teacher she said I should ask the sun about it.So what do you guys think? Can't it be in black color maybe we are not able to see such a kind of light or maybe it exists it some other galaxy?
I understand the basics of how vision works, but correct me if I'm wrong at any point.
Electromagnetic radiation is emitted from the sun as a byproduct of fusion, in the form of photons.
These photons travel a vast distance at an incomprehensible speed, and bounce around the atmosphere a bit.
A...
Hello,
In the picture above a couple are shown with their children. Or are they actually their children? Is it possible for them, having green (?) and hazel (?) eyes, to get 1 child with blue eyes and 3 children with brown eyes?
if a ray of monochromatic light comes from a denser medium to a rarer medium does the color reaching a viewer in the rarer medium differ from the actual color of light in the denser medium (as wavelength of light is different for both the media)?
In another thread, I came across the question of how the photon's energy and momentum appears in the moving frame. The question is best explained with the standard light clock.
Lets have 2 horizontal mirrors, that is, one above the other. In the rest frame, the photon is set up to be linearly...
First off I hope I'm putting this in the correct forum. My question is more than just the minimum amount of photons to make a single blip of white light, but more so the base photons in the visible spectrum of light. We have all seen a prism split light into violet, blue, cyan, green, yellow...
I am making a DIY spectophotometer.
What you see in this photo is flask of methyl orange solution in water with blue led in the back in a black box. As you can see the surrounding is blue because the box reflect blue light, however the light coming through the flask is orange. I don't...
I'm writing a Science Fiction story which has one place where time runs at normal speed, and another place next to it, where time runs at a much slower speed. If you stand in the normal place and look into the slow place, you will see people moving around as if in slow motion.
But what would...
Say you have a cross section of an electric field, and you want to make a visualization, not just of the magnitude, but showing each 3 components (negative and positive). What kind of colour transfer function scheme would you think is best in order to show the information that a physicist would...
According to the adverts one puts this sheet of whatever it is in the washing machine and it stops color transferring to other clothes in the machine, so how do they work?
I've heard people saying things like charge isn't real, but the suceptibility to a force is definitely real. Whatever charge actually is, or rather, what causes it, we know that electrons have it and neutrons don't. Any references to papers or web pages or anything on this?
Thanks.
P.s...
hi guys, i just read a passage about colors to our vision
it is a fact that we see an apple being red because it reflects red and absorbs the rest of the colors
so my question is, is it possible to change the amount of reflection and absorption of an object and hence we see it with a different...
Hi all,
Does anyone know where I can find data details of how Emission Spectra depends on temperature for the following materials:
Single Hydrogen
Molecular Hydrogen (H2)
Helium
That is, as I heat up each of the above materials by themselves, from room temperature to thousands of degrees, I'd...
So, you'll have to forgive me, but I am an engineer, not a physicist, but I take an interest in quantum gravity. My understanding is primarily conceptual, not mathematical. So if my question is dumb, I apologize. Ok, here goes:
I'm aware of Zwi Bern's conjectured color-kinematics duality...
Hi all,
Has anyone an idea how can we derive the color factor ## C_2## , eq. 27 in
http://authors.library.caltech.edu/8947/1/GREprd07.pdf ?
## C_2 ## belongs to the second Feynman diagram in fig. 3 which includes two gluons and 4 octet scalars .
Best.
Hi there,
In paper as :
http://authors.library.caltech.edu/8947/1/GREprd07.pdf
I don't understand the colour factor associated with two gluons and single octet scalar as the first Feynman diagram in fig. 3 ?
In eq. 27, this colour factor is given by ## (d^{abc})^2 ## .. so, how did this come...
http://www.xrite.com/online-color-test-challenge
Lower the number the better. I wish computer monitors can be used to test for Tetrachromacy. To learn more about Tetrachromacy go here:
http://nymag.com/scienceofus/2015/02/what-like-see-a-hundred-million-colors.html
I seriously doubt I am a...
I am trying to conceptually understand how form a color singlet for baryons and mesons. For example, the Wikipedia article http://en.wikipedia.org/wiki/Isospin shows how to construct the proton and neutron states in terms of isospin and spin. How does one create a color singlet corresponding...
hello there, i hope you can help me..
i have a halogen lamp 12V 50watt, in this lamp datasheet, i read there is 1200 cd (MAX).
is there any way to know how much the heat that lamp produces? without i testing using thermometer ..
Hi all,
I'm new to the forums.
I recently tried to take an image of two laser dots on a white wall, using my laptop's USB camera. I saved them to PNGs.
I have a number of questions...
1. There was an artifact with the green laser, where a smaller second dot appeared for some reason. What...
Mirabilis Jalapa exhibits incomplete dominance.
So, if we cross Red and White colored plants (Parental Gen), we get, pink flowers (Filial I Gen).
When these are selfed, we get red, pink, white in ratio 1:2:1
So, how do you determine that Red is dominant, because, we are dealing with incomplete...