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Related Experiment Videos

Saturation constancy in surface colors

M L de Mattiello, M Guirao

    Journal of the Optical Society of America
    |June 1, 1981
    PubMed
    Summary

    Surface reflectance impacts color saturation differently across hues. Saturation perception varies with colorimetric purity (Pc) and lightness, indicating distinct perceptual discrimination for these color dimensions.

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    Area of Science:

    • Color Science
    • Visual Perception
    • Psychophysics

    Background:

    • Surface reflectance and wavelength significantly influence perceived color saturation.
    • Previous research established power functions for saturation growth across different hues.

    Purpose of the Study:

    • To investigate how reflectance affects color saturation across various hues.
    • To compare the perceptual discrimination of saturation and lightness.
    • To examine the relationship between the quantity and perceived percentage of color.

    Main Methods:

    • Replotting numerical and matching judgments into monochromatic saturation power functions.
    • Conducting experiments comparing saturation and lightness judgments for heterochromatic functions.
    • Analyzing observer-assigned saturation values at specific colorimetric purity (Pc) convergence points.

    Main Results:

    • Monochromatic saturation functions for blue, green, yellow, and red hues intersected at invariant points of colorimetric purity and saturation.
    • Lightness perception increases linearly with reflectance, while saturation grows with the 0.5 power of Pc.
    • Perceived color percentage varied by hue, with yellows perceived as 40% of color at convergence points.

    Conclusions:

    • Color perception involves distinct mechanisms for saturation and lightness, with saturation showing a non-linear relationship with colorimetric purity.
    • A linear interpolation model can predict saturation-lightness relationships for un-tested hues.
    • The perceived quantity of color is hue-dependent, influencing subjective color experience.

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