“Mere color, unspoiled by meaning, and unallied with definite form, can speak to the soul in a thousand different ways.”
There are so many things to say about our color perception. For example, the Human eye is capable of seeing between 7 and 10 million colors. Question: why is that massive range of perception so important?
We can define color vision as the ability of our eyes and brain to distinguish objects based on the wavelengths (or frequencies) of the light they reflect, emit, or transmit. We can point out that the typical human eye is only capable of perceiving light at wavelengths between 390 and 750 nanometers (the “visible” spectrum for Humans), and that our perception of colors is a somewhat subjective process – we all see the same illuminated object or light source a bit differently.
We can delve into the neurological process of three types of cone cells in the retina (up to 7 million) gathering information about visible wavelengths of light that correspond to short-wavelength, medium-wavelength and long-wavelength (red, green, blue). We can even frame the definition of vision as the process of perceiving color:
“‘Vision,’ by common usage, suggest a process; but it is now known that it is built out of many processes, subdivided into at least 32 areas. Before they eye’s input gets to the cortex it goes through two vision systems. One sees motion, and the other color. They largely come together in the primary visual cortex. Nonetheless, the overall visual system continues to stream continues this division into higher areas of the cortex. Vision goes into what a stream that identifies things and into a where stream that locates their positions. And even this description is a gross simplification.” Sagan & Skoyles, Up From Dragons
But the perception of color is much more complex …
What we see as color is, in a sense, an absence of colors. White light from the sun hits an object – let’s say a blue object – and all of the color in the white light (the full spectrum) is absorbed by the object with the exception of blue (and perhaps ultra violet and infrared). The blue is reflected to our eyes. The cones in our retina are stimulated at a specific frequency and sent to our brains for interpretation. We see blue – unless, of course we’re color blind.
But all color is perceived in context, as explained in Neuroscientist, Dr. Beau Lotto’s TED Talk,
Dr. Lotto sums our experience up like this, “The light that falls on your eye (sensory information) is meaningless, because it could mean literally anything. … There’s no inherent meaning of information, it’s what we do with that information that matters.”
Dr. Lotto also provides an example of why we evolved to see colors – pure survival. The example he gives in his TED Talk involves seeing a predator in the jungle. But there are alternative hypotheses.
Theoretical neurobiologist Mark Changizi has speculated that the reason Humans see is because it gives us an advantage in sensing emotions or health on the skin of others. Other neuroscientists suggest that our ability to see many shades of green help us differentiate between and choose plants to eat versus avoid poisonous ones.
No matter how we see the world, there always seems to be another view (as followers of biocentrism might say). Here are just a few interesting facts that we know about color:
- Color Blindness: Men have a higher chance of being color blind than women. 1 out of 12 as opposed to 1 out of 255. The most common type of color blindness is the disability to tell the difference between red and green.
- Tetrachromats: About 1.36% of the world’s population (only women) have a fourth type of cone cell in their retinas, (resulting in Tetrachromacy) giving them true four-color vision allowing them to see more than 100 million colors.
- Depression & Color: Research published by Dr. Emanuel Bubl demonstrates that the retinas of depressed patients were less sensitive to contrast – making colors appear duller.
- Shades of green: Human cones in the eye are more sensitive to green frequencies than any other. Humans are omnivores, so that not only can differentiating between shades of green plant help us find edible plants and avoid poisonous ones.
- Ultraviolet colors: The Human eye is capable of seeing ultraviolet when the lens is Removed – some people are born with Aphakia – the absence of the lens on the eye. The great impressionist painter Claude Monet developed cataracts in his old age and after struggling to paint (with his colors washed out) he decided to, at age 82, have the lens of his left eye completely removed – the operation allowed him to see familiar colors, but it also let him see, and paint in ultraviolet (colors we cannot see).
Web Development Application
Understanding color in for development can be very helpful, underestimating its importance can be crippling, for example, not understanding the limits of users with color blindness. The best bet for avoiding issues is to have a knowledgeable graphic artist on your team.
- Photoreceptor cell
- Color Vision
- Naked eye
- Ishihara Colour Test
- How Do We See Color?
- How Many Colors Can Most of Us Actually See?
- Resolution of the Human Eye
- Beau Lotto’s TedTalk, Optical illusions show how we see
- Why Humans Have Color Vision, and Other Qs & As with Neuroscientist Mark Changizi
- The Human Eye Can See in Ultraviolet When the Lens is Removed
- Monet’s Ultraviolet Eye
- Decreased Perception of Color in Depression
- Why does the human eye see more shades of green than any other colour?
- Sagan, Dorian & Skoyles, R. John (2002) Up From Dragons, The Evolution of Human Intellience. City, State: R. R. Donnelley and Sons Company