COLOR IS PROPERTY OF THE OBJECT
All colors exist completely independent of the human brain. 



First of all, Light HAS colors.
White Light (Brightness) IS actually all colors mixed:

1. All colors exists outside of the brain, If didn't, then white light (brightness) couldn't exist either, because white light is actually all colors mixed and there is no other way that light could exist without colors, as the video above showed.
2.  And we know tha white light (brightness) exist outside of our brains,. we know this by nature, by insects (they seek brightness for their survival), jellyfishs (detect brightness and change in color to attract their prey, and they have no brain), the best proof are the octopus, The octopus can detect the brightness without brain or eyes, and they do it for their survivor.) http://earthsky.org/earth/octopus-senses-light-with-its-skin
3. Thus, proving that white light (brightness) exist OUTSIDE of your brain or eyes.
4. And since white light (brightness) doesn't need your human brain or eyes for Its existence, and we do know that brightness is a mixture of all colors and cannot exist without colors, we assume that this is a EVIDENCE that all colors are real outside of the perception or eyes to see it.

Color is property of the object...

Color is property of the object. Yes, colors do exist outside of the brain, Objects can be thought of as absorbing all colors except the colors of their appearance which are reflected, A red apple absorbs all wavelengths of light except red light, which it reflects, A blue ball absorbs all wavelengths of light except blue light, which it reflects, A yellow filter absorbs all wavelengths of light, except yellow light...Every object have Its own unique color, and ONLY because of this we get the wavelength corresponding to the color reflected, Any peace of transparent color glass is a filter, letting through light of Its OWN COLOR, If some other light strikes the filter, It cannot get through, that's an example why every object has Its own unique objective color.. (as the image below shows)

You can see a detailed explanation in the video below: (at 8:00)

I can describe the language representations of colours in an objective way:
Red is ~650 nm, which predominately activates the cone cell for red.
Green is ~520 nm, which predominately activates the cone cell for green.
Blue is ~400 nm, which predominately activates the cone cell for blue.
Light with wavelengths in between these can activate more than one cone cell. Light can also contain more than one wavelength of photons at the same time.
If both red and green cone cells are activated at the same time, it is experienced as a different colour called yellow (or chartreuse, orange depending on proportions).
Green + blue is called turqoise (or cyan, aquamarine depending on proportions).
Red + blue is called magenta (or pink, purple depending on proportions).
Red + blue + green is called white and an absences of light is called black.

Pigments are substances that absorb or reflect light. For instance, a red pigment is one that absorbs light that corresponds to red. When you mix pigments, they don't behave like adding light sources of different colour. If you mix a substance that absorbs light wave that correspond to green (appears magenta as it reflects blue and red) and a substance that absorbs red (appears cyan, as it reflects blue and green) what you get is not magenta + cyan, instead you will absorb both red and green and it will appear blue.



IF absolutely no light was present and you were in a dark room, the orange would still be orange, because its structure (Its own color) only allows it to reflect that color. So once you turn on the light it will be orange for your eyes. So, basically we will see the wavelenght reflected (this wavelength is the wavelength corresponding to the object color, so If your cones are working properly you will se exactly how it is)
watch the video vlow  to a deeper understanding about colour blindness:

Is your red the same as my red?
YES, It is!
The brain does not directly perceive electromagnetic waves, photoreceptor cells in our eyes do. What the brain actually perceives are synaptic signals from photoreceptor cells. The question that should be asked is: Do our photoreceptor cells generate the same synaptic signals per individual with respect to color? The answer? Each rod and cone in the human retina generates a consistent synaptic pattern per frequency of light (specific proteins and electrical impulses). That means the same general sequence of signals are sent for each frequency to the brain. So yes, your red is my red. What differs between individuals are the number of rods and cones per retina as well as the distribution. There are blue, red and green cones and rods. Normal vision has mostly red, some green and a few blue sensitive cones. Colorblind people have one type of cone dominating the others.
Our eyes works to get the correct color of the object (as explained in the above), so, If you don't suffer from colour-blindness, and If you have at least the 3 necessary cones to see the colors of  the world, then you will see exactly how it is, Our biology is all the same and it's safe to assume that this elicits a similar signal to the processing of colors. However biology/nature isn't perfect and there are flaws in the system, which is when we can expect certain differences (maybe you will see more shades of red than me, but the wavelength corresponding to red IS the real color of the object, and WILL BE processed correctly in your eyes, so your eyes will form 'red' (doesn't matter if you have 3, 4, or 12 cones) red is red, and red must be processed as 'RED' (as the video above showed).
 Just ask any tetrachromatic person (they have more cones) and they will tell you that they still seeing the grass in green, obviously they can see more colors in nature, but the grass continues to be green.
So keep in mind, there is no way that your green could be different than my green (If we have our 3 cones  working properly).



 Color is NOT dependent of our brains or eyes.
If that was the case then every camera would need to have a living brain and a living set of eyes attached to it.  How else would the camera be able to record images in color?   Cameras are just a machine with very light-sensitive film that does nothing else but react to specific wavelengths of light that are exposed to it.  No brain, no eyes.  Yet it still is able to record any color.That's because the colors ARE "out there".  When the shutter of the camera opens it lets them hit the film within.  That's all there is to it.  Our eyes and brains are basically the exact same thing as a camera when it comes to seeing colors.  Every camera records pictures of the real-world colors.  Have you ever seen a photograph of purple person against a orange sky,  with pink clouds?  Sure some film may be cheap in quality,  but it won't make that kind of mistake. Color IS in fact "out there",  separate from us,  just like gravity, streets and everything else.  It doesn't need our brains and eyes to perceive it or interpret it.  If every single person on earth were to die tomorrow,  nothing would happen to the colors we see now,  they'll still be the same as they always have been, day in and day out.You can argue (yes, but you are seeing it, that's why It's colored) No, remove your brains and the image still there, and colored,  It's doesn't transfer anything into a "perception just for our brains,  Rather, it captures the exact wavelengths of light/color in a nearly perfect mirror image as a record.  A record that is an independent verification of what the real world looks like when viewed eyes or a brain



 Brain Achromatopsia as a proof 
Before it was believed that brain achromatopsia makes people see everything black and white, but today we know that this is not true. What actually happens is the opposite and what might be called Blindsight (no experience of colors, but continue to see them with the eyes). A 48 year old man who suffered a brain haemorrhage leading to damage to the occipitotemporal cortex. He survived, but reported that he could no longer have conscious experience of colors: his color vision remained normal, though he couldn't experience them. This is known as cerebral achromatopsia. This is more than a proof that colours has nothing to do with your brain.
Source: http://www.karger.com/Article/FullText/351027


 People who born blind as a proof 
Another good debunking for those who believe that color is somehow "magically" created in the brain are people who born blind, just  just search google "people who born blind what they dream?" If an individual is congenitally blind, it is physically impossible for them to "see" anything at all.. The thing is that the brain cannot develop without stimulation. So, if someone is born blind then they are not receiving the visual stimuli that is necessary to develop the visual hallucination (psychedelics) or to dreams at night. In this case, the person may experience aural, olfactory, and tactile hallucinations, but no visuals. However, if the person went blind later in life, they still would probably have some kind of visuals"

Perception of color
Now, our perception is relative. Relative to your biological hardware that evolved to see color. Such as your cone cells.. If you have more red cones than someone else, you’re going to be able to see more shades of red. If you’re lacking green cones, you’re not going to be able to see green. That’s how light works.. It strikes an object and reflects back the corresponding wave length. Infrared and UV light waves are not light waves that interact with an object’s color, rather other properties. Such as a flower petal having a surface that is able to reflect UV light. Your cone cells have actual pigment in them.. Red pigment in red cones, green in green cones, and blue pigment in blue cones. Each individual cone cell has countless pigments in it, each with varying degrees of concentration. So when you’re looking at some green grass, sunlight is hitting it and reflecting back a very specific wave length. The grass is green, and the light wave reflected back is corresponds to the color green, and it will be able to pass through a specific concentration of green pigment in a green cone cell. If you don’t have any green cone cells, there will be no green pigment to allow the light wave that corresponds to green to pass through. So there is green color to grass, a wavelenght reflected back that corresponds to green, and will be perceived in your eyes by your cones and sent the result to your optic nerve. Color exists out in the world.. but how we perceive it, is relative. Luckily for us, through our evolution we’ve developed full color vision. Although, your brain can really jack up the signals being interpreted.. such as synesthesia, our brain isn't creating, it is interpreting.

Other considerations
Why do chameleons bother changing color? Because in the most important sense (that predators can see them) colors exist.
Why do Jellyfishes changed their color? Jellies have also adapted their body color to camouflage in the darkness. Jellies changes Its colors to attract their preys, and this all happens in the sea with no brains and human's presence.
Another good example are Infrared vibrates atoms, UV freed electrons, and Milimeter-wave moves atoms. Surely Infrared has explicitly different meaning to atoms & molecule than a UV has to them. IF your eyes sees each spectrum as distinct color of distinct 'meaning', then same is for nature (atoms and molecules) which it gave different actions to them; it ISN'T a continuum of spectrum that mean nothing like in drawings. 
The idea that 'color' didn't exist outside human mind is debunked...