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Question -

What is colour vision and what are the dimensions of colour?



Answer -

  • A person’s ability to distinguish different shades of colour is termed colour vision.
  • Person with normal colour vision can distinguish more than seven million different shades of colour.
  • There are three basic dimensions of colour-hue, saturation, and brightness.
  • Hue is property of chromatic colours. It refers to the name of the colour, e.g.,red, blue, and green. Hue varies with wavelength, and each colour is identified with a specific wavelength. For example, blue has a wavelength of about 465 nm. and green of about 500 nm. achromatic colours like black, white or grey are not characterised by hues. .
  • Saturation is a psychological attribute that refers to the relative amount of hue of a surface or object.
  • The light of single wavelength (monochromatic) appears to be highly saturated.
  • As we mix different wavelengths, the saturation decrease. The colour grey is completely unsaturated.
  • Brightness is the perceived intensity of light. It varies across both chromatic and achromatic colours.
  • White and black represent the top and bottom of the brightness dimension.
  • White has the highest degree of brightness, whereas black has the lowest degree.

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