QS Study

Color Vision is the capacity of an organism or machine to differentiate objects based on the wavelengths of the light they reflect, release, or transmit. It is a perception of and ability to distinguish colors. It is an illusion created by the interactions of billions of neurons in our brain. It is mainly used in disorderly natural scenes, where intensity variations may arise from either shadows or object borders.

Characteristics of color: Colors have three attributes:

  • Hue,
  • Intensity and,
  • Saturation (degree of freedom from dilution with white)

For any color, there is an implementing color that, when properly mixed with it produces a sensation of white. It is dependent on retinal cone cells, which express photoreceptors that are sensitive to specific wavelengths of light.

The Young Helmholtz theory

The Young Helmholtz theory of color vision in humans postulates the existence of three kinds of cones. Each containing a different photopigment and maximally sensitive to one of the three primary colors, with the sensation may be given color is determined by the relative frequency of the impulse from each of their cone system.

Mechanism of productions color vision

  • If the cones containing all the primary colors sensitive pigments are equally stimulated simultaneously by the three primary colors, the nervous system interprets this sensation as white.
  • If the cones containing the entire primary colors sensitive photopigment are not estimated the thing looks like black.
  • If the cones containing primary color green sensitive pigments are stimulated then the thing looks green,
  • If the simultaneous stimulation of different cones by different ratio of primary color occurred then the thing looks different color like orange or yellow etc.