Enough already! In photography, there are 2 schemes for color: additive and subtractive. In one scheme, black is all colors, white is none. In the other, white is all colors, black is none. So there, you might be right or you might be wrong. I hope that settles it.
<< Things that are made to look black are actually very very very very dark brown or dark purple. >>
Yeah, I had a printer that did that!
yup. a black crayon is made of stuff that absorbs most of the light that hits it, and since theres very little light reflecting off of it, your eyes percieve that lack of light as "black"
a red crayon is made of stuff that absorbs everything except the red wavelengths of light. since the red waves bounce off and into your eye, you see "red"
black is when most of the light gets absorbed.
white is when most of the light gets reflected.
a red crayon is made of stuff that absorbs everything except the red wavelengths of light. since the red waves bounce off and into your eye, you see "red"
black is when most of the light gets absorbed.
white is when most of the light gets reflected.
With light the primary colours are Red, Green and Blue.
All together make White, and the absence of all make black.
With pigment (paint, etc) it works a little differently, because the colour of paint is based upon what light it absorbs and what light it doesn't.
Mixing all 3 primary colours of paint in the right proportion will give you black because you will have a pigment that absorbs all light.
Black is the absence of EM radiation in the "visible light" range.
The human eye detects various wavelengths of electromagnetic radition and percieves different wavelengths as different colours, black is the absence of any EM radiation in the visible light range, thus black is the absence of colour as percieved by a human eye.
Black the Crayon Colour as I mentioned before is a pigment that absorbs all wavelengths of the EM spectrum that fall under the visible light classification, thus there is no relfected radiation that our radition detectors (eyes) are tuned for.
The section of the EM spectrum reffered to a "visible" light, and the subsections that define various colours are defined in terms of what the human eye precieves. There is nothing special about visible light, from an EM radiation standpoint it's no different than infra-red or ultra-violet (well it's a different wavelength in the spectrum), but since we can see that portion of the spectrum, we define it differently.
Edit:
I hope I didn't confuse anyone...I wasn't trying to be overly technical...but to properly understand what "Black" is you have to understand a bit about how the eye works.
All together make White, and the absence of all make black.
With pigment (paint, etc) it works a little differently, because the colour of paint is based upon what light it absorbs and what light it doesn't.
Mixing all 3 primary colours of paint in the right proportion will give you black because you will have a pigment that absorbs all light.
Black is the absence of EM radiation in the "visible light" range.
The human eye detects various wavelengths of electromagnetic radition and percieves different wavelengths as different colours, black is the absence of any EM radiation in the visible light range, thus black is the absence of colour as percieved by a human eye.
Black the Crayon Colour as I mentioned before is a pigment that absorbs all wavelengths of the EM spectrum that fall under the visible light classification, thus there is no relfected radiation that our radition detectors (eyes) are tuned for.
The section of the EM spectrum reffered to a "visible" light, and the subsections that define various colours are defined in terms of what the human eye precieves. There is nothing special about visible light, from an EM radiation standpoint it's no different than infra-red or ultra-violet (well it's a different wavelength in the spectrum), but since we can see that portion of the spectrum, we define it differently.
Edit:
I hope I didn't confuse anyone...I wasn't trying to be overly technical...but to properly understand what "Black" is you have to understand a bit about how the eye works.
Ok, there are a lot of really confusing "explanations" in this thread.
Think about this:
1) Whether black and white should count as colors is a philosophical question more than a physical question.
2) When mixing light, white is the product of mixing everything together. When mixing paint (or any other common pigmented substance) black is the product of mixing everything together.
-jothaxe
*edit*
I posted this right after your post Noriaki, and your explanation is pretty clear.
Think about this:
1) Whether black and white should count as colors is a philosophical question more than a physical question.
2) When mixing light, white is the product of mixing everything together. When mixing paint (or any other common pigmented substance) black is the product of mixing everything together.
-jothaxe
*edit*
I posted this right after your post Noriaki, and your explanation is pretty clear.
<< Hmmm...well, a black hole is perfectly black because it's sucks up any possible light because nothing escapes is pull. Based on that reasoning I would say that black is "no color." >>
Actually, black holes aint so black. Ask Stephen Hawking!
-jothaxe
Light primary colors-Red, green, blue
Pigmented substance primary colors-Red, blue, yellow(magenta, yellow, and cyan)
Pigmented substance primary colors-Red, blue, yellow(magenta, yellow, and cyan)
<< 1) Whether black and white should count as colors is a philosophical question more than a physical question. >>
Really, white is a mixture of all reflected colors, it is all colors. Black is no colors. So really neither of them are a singular "color"...
wow, pretty neat Noriaki and all others who gave gave technical answers. thanks all
how do you guys know this right off hand?
man i must have really bad memory.
how do you guys know this right off hand?
man i must have really bad memory.
<< wow, pretty neat Noriaki and all others who gave gave technical answers. thanks all
how do you guys know this right off hand?
man i must have really bad memory. >>
hehehehe
I enjoy physics, especially optics.
Not my major area of study but I've taken a few electives in that area just for kicks. A basic understanding of visible light is kind of important in optics
I don't remember much details, but the basics have kind of stuck with me.
<< Black= all colours
White= the absence of colour
Only true on opposite day >>
Actually it's true if you are reffering to pigment rather than light
It's exactly opposite if you are reffering to light.<<
<< 1) Whether black and white should count as colors is a philosophical question more than a physical question. >>
Really, white is a mixture of all reflected colors, it is all colors. Black is no colors. So really neither of them are a singular "color"... >>
By this logic, any object that does not reflect precisely one wavelength does not have a true color. This does not make sense to me, and is why I claim it is a philosophical question.
-jothaxe
funny.
theres a cartoon in the sunday comics that explains science questions in ways that kids can understand. once a child wrote in asking about light and colors, so they answered it with some easy experiments for kids, and part of the explanation said that the three primary colors of light are red, green, and blue.
then they got a whole bunch of angry letters from kids and their parents saying how everyone knows that the primary colors are Red, blue, and Yellow. this, of course, is what the kids had learned in school. They all said that the scientist who writes the comic strip should know better, and shoudnt make stupid mistakes like this that confuse little kids.
the next sunday, there was a strip explaining the difference between the primary colors of light and the primary pigments in paint. And the author told the kids to tell their parent to be a little nicer when writing letters to the newspaper.
<<
<<
<< 1) Whether black and white should count as colors is a philosophical question more than a physical question. >>
Really, white is a mixture of all reflected colors, it is all colors. Black is no colors. So really neither of them are a singular "color"... >>
By this logic, any object that does not reflect precisely one wavelength does not have a true color. This does not make sense to me, and is why I claim it is a philosophical question.
-jothaxe >>
I have to agree with Jothaxe on this one.
I guess if you consider colours a discrete set, Red, Orange, Yellow, Green, Blue, Indigo, Violet, etc....then in a way an object that is one of those colours is only reflecting one colour....but that's not really true. Any "colour" is made up of several waves with different wavelengths in the EM spectrum. White just happens to be more waves than say red....
So humans are making a distiction/definition based on what we percieve. All "colours" including black and white are just a collection of EM radition waves. Black happens to be fewer waves than most, white happens to be more. But from a scientific viewpoint that distiction is really not that important.
Thus is becomes a philisophical question (not to say that philisophical questions are unimportant, various philosophers are some of the most important figures in huamn history).
I was told that black was a shade. not a color.
white and grey and all the stuff in between are supposed to be shades too.
white and grey and all the stuff in between are supposed to be shades too.
<< I have to agree with Jothaxe on this one.
...
Thus is becomes a philisophical question (not to say that philisophical questions are unimportant, various philosophers are some of the most important figures in huamn history). >>
Thanks for your support, Noriaki.
And I fully agree: I think that philosophy is quite valuable.
-jothaxe
Conclusion: black is a color as well. Except when you're talking about black holes, an object never absorbs every wavelength (this is physically impossible) so it'll always be a color since always some radiation is returned.
scientifically...black is the absence of light. anything that is truly black, you WOULD NOT BE ABLE TO SEE because no light rays are reflecting off of it, and into your retina. white on the other hand, is every color in the light spectrum..red, orange, yellow, green, blue, indigo, and violet.
<< scientifically...black is the absence of color. >>
Argh...
Repeat after me: Black is the absense of light. If you assume that with 'light' is meant the visible EM spectrum, then indeed, black is the absence of light.
Of course, the EM spectrum is much bigger than just the (for us) visible part, so a black (to us Humans) object will always be visible in another part of the EM spectrum.
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