Rainbows & bands of colour

About rainbows and bands of colour
  • There are several reasons why an observer looking at phenomena like rainbows perceives bands of colour.
    • The human perceptual system tends to simplify colour information rather than perceiving a smooth gradient across the spectrum.
    • Our eyes respond to colours based on their relative brightness and hue when presented with a portion or the entirety of the visible spectrum.
    • Observers tend to search for colours they are familiar with and can recognize and name.
    • Cone cells in our eyes are especially sensitive to red, green, and blue wavelengths due to the trichromatic nature (trichromacy) of human vision.