Response of Human Cone Cells to Colour

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Description

Response of Human Cone Cells to Colour

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Photo-transduction takes place when rod and cone cells in the human eye convert their chemical response to light into electrical signals ready to input into the visual system.
Trichromacy refers to the idea that humans are capable of colour vision as a result of the sensitivity of our eyes to three regions of colour within the visible spectrum.
Researchers estimate the number of colours the human eye can distinguish is between one and seven million.

About the diagram

Some key terms

Visible light is the range of wavelengths of electromagnetic radiation perceived as colour by human observers.

The trichromatic colour model is a theory of colour that establishes terms, rules and methods to enable human colour vision to be dealt with in both systematic and practical ways.

  • Colour vision is the human ability to distinguish between objects based on the wavelengths of the light they emit, reflect or transmit. The human eye and brain together translate light into colour.
  • Colour is not a property of electromagnetic radiation, but a feature of visual perception.
  • The human eye, and so human perception, is tuned to the range of wavelengths of light that make up the visible spectrum and so to the corresponding spectral colours between red and violet.
  • Light, however, is rarely of a single wavelength, so an observer will usually be exposed to a spread of different wavelengths of light or a mixture of wavelengths from different areas of the spectrum.
  • An observer’s perception of colour is a subjective process as the eyes and brain respond together to stimuli produced when incoming light reacts with light-sensitive cells within the retina at the back of the eye.
  • The perception of colour can be influenced by various factors, such as lighting conditions, surrounding colours, and individual differences in colour perception.

A human observer is a person who engages in observation by watching things.

Colour is not a property of electromagnetic radiation, but a feature of visual perception by an observer.

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