Understanding Color Perception: Why Do We See Different Colors?

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In summary, the conversation discusses the reason behind why objects appear to have different colors even when they are receiving light from the same source. It is explained that this is due to the absorption of certain frequencies of light by the material, which then determines the color we see. It is also noted that our perception of color is a biological phenomenon and is not necessarily a direct representation of the frequency of light. The concept of black as the absence of light is also mentioned.
  • #1
repugno
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Hello all,

I’m interested in finding out why we see different colours. I know that different colours arise from different wavelengths of electromagnetic waves. But why are objects different colours if the light reflecting comes from the same source? Is it because the objects absorb some of the light thus altering the wavelength of the wave and so we see a different colour? What is the reason? Any help would be much appreciated. Thanks
 
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  • #2
White light contains all colors. When we see an onject of a given color, it means that color is reflected and others are absorbed. You also have to realize when we see something of a given color, it is not usually a single frequency, but a mixture which looks to us the color we see.
 
  • #3
The absorption of light by a material depends on (among other things) a property known as its dielectric constant. This number veries with the frequency of the incident light. Hence, any given material absorbs more in certain frequencies and less in others. What is not absorbed is either transmitted through the material (this happens a lot in glass) or reflected. The frequency distribution of this unabsorbed light is what determines the color of the material.
 
  • #4
Keep in mind that the color you see is actually a biological phenomenon. Just because you see green does not necessarily mean that your eyes are sensing light of a particular wavelength. Different combinations of wavelengths can produce this same sensation.
 
  • #5
I have an stupid question:

Has the black color a a wavelenght defined?.
 
  • #6
No. Black is our experience of the absence of light. Our internal experience of color is not a direct map of frequency, but has other parameters, created by processing in our brains. Look up Color Theory.
 

1. Why do we see different colors?

The human eye contains specialized cells called cones that are responsible for detecting different wavelengths of light. These cones send signals to the brain, which interprets the signals as different colors. Additionally, the way light is absorbed and reflected by objects also contributes to the perception of different colors.

2. What causes color blindness?

Color blindness is caused by a genetic mutation that affects the development or function of the cones in the eye. This can result in difficulty distinguishing between certain colors or seeing only shades of gray. In rare cases, color blindness can also be acquired through injury or disease.

3. Why do some people see colors differently?

Individuals may see colors differently due to variations in the number and distribution of cones in their eyes. Additionally, cultural and linguistic differences can also play a role in how colors are perceived and described.

4. How do colors affect our emotions?

Colors can have a strong impact on our emotions and mood. This is due to the way different colors stimulate the brain and trigger different responses. For example, warm colors like red and orange are often associated with energy and excitement, while cool colors like blue and green can evoke feelings of calmness and relaxation.

5. Can colors affect our perception of size and shape?

Yes, colors can have a visual effect on the perception of size and shape. Bright colors tend to appear larger and more prominent, while dark colors can make objects appear smaller or recede into the background. Similarly, colors can also create illusions of depth and dimension in artwork and design.

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