Questions tagged [color]

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30 views

Can I change the type of melanin I have [closed]

So both of my parents are light skin african Americans and my sister and I are light. We have white people skin color. I was wondering if there was a way for my to change my melanin type from ...
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1answer
47 views

Why do colors clash in your brain?

Wen pairing two or more colors together, some "clash" or cause a effect visually where the two colors meet. To me it appears to be a black line between the colors or shading when in fact ...
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2answers
56 views

How can animals that rely on SONAR not see color? [closed]

Humans can sense colors with acuity and can distinguish them because of the light of different spectrum that follows into their eyes. Not its also said that sound is different for different colors, ...
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3answers
165 views

What is "beto carotene" and how can it turn lakes pink?

The BBC News article Pink lake in Australia attracts and delights tourists describes an artificial salt lake in Westgate Park, Melbourne, Australia that tuns pink around February and then in "late ...
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2answers
43 views

Is there any record of an Albino (Not leucistic) peacock

Wikipedia says there are, however gives no source to one. Does anyone know if an albino peacock was ever recorded?
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0answers
30 views

Is there a color changing organism that is by default translucent or otherwise "colorless"?

To illustrate a point I am trying to make in a paper I am writing it would be helpful to have an example of an organism that by default has "no color" but which can adopt the color of ...
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28 views

Why does Cyan appear bluish rather than greenish, when the phototopic eye sensitivity is highest in green (and Cyan contains blue and green equally)?

Cyan contains blue and green equally. Phototopic eye sensitivity is highest in green. Why, then, does Cyan appear bluish to most of us, rather than greenish?
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1answer
286 views

Multiple numbers in the Ishihara test?

When I was in high school (30 years ago), I took a biology class, and the instructor showed us an Ishihara color test for color-blindness. (This is the "hidden numbers" test.) What I thought I saw ...
3
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1answer
62 views

Is it possible to discriminate tetrachromacy using sRGB color?

Hi I'm a physics grad student who has lots of interest on color perception. I have recently learned that some people (mostly women) have another active cone cell which makes them possible to ...
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1answer
80 views

How does a "chromogenic mixture" produce such pronounced color differences in this Agar Art?

The Forbes.com article Bacteria Become Art Tools In Annual Agar Art Competition says: ...People’s choice winner Zita Pöstényi, a microbiologist at SYNLAB Hungary Ltd, used three agar plates and four ...
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0answers
213 views

Is it possible to simulate tetrachromatic vision in a trichromat?

Suppose we are able to stimulate the whole matrix of cones of a human retina, targeting each cone individually¹. Normally we would project an image in the LMS color space onto the cones, in such a way ...
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28 views

Are MacAdam ellipses theoretically predictable?

MacAdam ellipses were found as a fit to experimental results on color matching by human observers. Multiple color spaces attempting to make euclidean distances more perceptually uniform, like CIELAB ...
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23 views

Database of colors mapped to species

I was wondering about the physics of color, and now am interested in finding out if there are any resources (databases, text files, html tables, or pdf listings) of species and their associated colors ...
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21 views

Ink blue molds/fungi/dermatophytes

Which of the above has naturally ink blue hyphae? Are there any that make both Ochratoxin A and fumononis toxin and have hyphae that color?
2
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1answer
220 views

How credible is the Remenko's two-component color vision theory?

I've come across an article (in Russian), which describes a nonlinear two-component color vision theory made in 1975 by S. Remenko. The article heavily criticizes trichromatic theory as very imperfect....
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0answers
23 views

Is there a glossary about which infrared (IR) colors which body parts reflect?

I am doing medical research and I'm trying to find parts of the body that look about the same to the human eye, but reflect different "colors" in IR, so that using a light source and a camera of that ...
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1answer
175 views

Deuteranopia confusion lines

For people with protanopia (absence of "red" cones), confusion lines look like this (which is quite intuitive for me) Analogous picture for tritanopia (absence of "blue" cones) But picture for ...
5
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1answer
117 views

Do Colorblind People Have Stronger Sensitivity in Their Other Remaining Cones?

I came across this paper Color defect and color theory. The paper explained about how unilateral color blind (people who color blind only in 1 eye) actually see less bright in their color-blind eye (...
2
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1answer
184 views

Can some colours be processed faster/more accurately than others?

Is the human visual / motor system able to track, and move in response to, objects of certain colours more quickly and reliably than for others? By more reliably, I mean with greater accuracy in ...
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0answers
28 views

Does the ratio between M and L cone cells vary in one indiviual?

Wikipedia says: The ratio of M and L cones varies greatly among different people with regular vision (e.g. values of 75.8% L with 20.0% M versus 50.6% L with 44.2% M in two male subjects). This ...
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0answers
49 views

How many different colors can a normal human distinguish? [closed]

I am not talking about asking a person to sit for 10 hours to separate one color. I want to know is the normal person in a normal life. How many different colors can a normal human separate?
5
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2answers
267 views

Melatonin production, sleep, and "cyan light"; how might this finding be possible?

The BBC News article Cyan colour hidden ingredient in sleep describes research that suggests melatonin levels as measured in saliva could be affected by the presence or absence of cyan color in a ...
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1answer
705 views

How do you check how many cones you have in your eye?

Following my previous question: What color does the other cone in Tetrachromacy correspond to? People with normal color vision posses 3 cones in their eye. But there are some rare cases when people ...
3
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1answer
114 views

Trying to understand reduction of color dimension in colorblind case

I understand that dichromats have one of their cone missing/not functioning. And as for Monochromats, 2 or all of their 3 cones are missing/not functioning. And I read from Wikipedia - Color Blindness ...
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41 views

How many colors can colorblind people really see compared to normal color vision?

A person with normal vision, it seems, can see 7,000,000 colors. How many can a colorblind person see? I'm not as much interested in the exact number, or the technicalities that might exist due to ...
6
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1answer
166 views

What color does the other cone in Tetrachromacy correspond to?

Human with normal vision possesses 3 cones, which correspond to blue (S), green (M) and red (L). What about tetrachromacy, where people have 4 cones in their retinae? What is the fourth cone exactly, ...
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0answers
72 views

If longer wavelength color is perceived faster by human, what about non-spectral color (black)?

Related to human vision, I read the hypothesis about how longer-wavelength color is perceived faster by human eye than shorter-wavelength color source : A Brief Classification of Colour Illusions. But ...
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1answer
1k views

For humans, why is red the color of distinction rather than green? [closed]

The human eye is most sensitive to the color green. However, for some reason red is often selected as the color of distinction or alert. For example, in Renaissance times, painters would outline their ...