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Color perception through atmospheric haze.

R C Henry1, S Mahadev, S Urquijo

  • 1Department of Civil Engineering, University of Southern California, Los Angeles 90089-2531, USA.

Journal of the Optical Society of America. A, Optics, Image Science, and Vision
|May 5, 2000
PubMed
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Atmospheric haze makes distant landscapes appear blue, yet we see colors. This study explains this paradox by showing the visual system separates light, keeping colors constant despite haze.

Area of Science:

  • Atmospheric optics
  • Visual perception
  • Color science

Background:

  • Light scattering in the atmosphere typically imparts a blue hue to distant objects.
  • Human visual perception allows for the discernment of colors in landscapes despite atmospheric effects.
  • A paradox exists between the expected blue appearance of distant scenes and the observed perception of color.

Purpose of the Study:

  • To explain the phenomenon of seeing distinct colors in distant landscapes through atmospheric haze.
  • To mathematically model how the visual system processes light interacting with atmospheric haze.
  • To investigate the relationship between atmospheric optical depth and perceived color properties.

Main Methods:

  • A mathematical model was developed to describe the splitting of light into haze and background components.

Related Experiment Videos

  • A color matching study was conducted in the Great Smoky Mountains National Park.
  • The study analyzed how hue and colorfulness change with varying optical depth.

    • Main Results:

    • The mathematical model successfully explained the results of the color matching study.
    • Object hues remained constant despite changes in atmospheric optical depth.
    • Object colorfulness decreased exponentially as optical depth increased.

    Conclusions:

    • The visual system's ability to separate light into haze and background layers resolves the color paradox.
    • Perceived hue is invariant to atmospheric optical depth under this model.
    • Colorfulness diminishes predictably with increasing atmospheric haze.