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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
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Visualizing Visual Adaptation
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Adaptation under dichromatic illumination.

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    Spatial complexity impacts chromatic adaptation. A new model considers this complexity for more accurate color predictions under varied lighting conditions, moving beyond simple uniform stimuli.

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    Area of Science:

    • Color science
    • Visual perception
    • Computational imaging

    Background:

    • Chromatic adaptation transforms (CATs) like CMCCAT97, CAT02, and CAT16 predict color changes under different illuminants.
    • Existing CATs typically use uniform stimuli and backgrounds, limiting their accuracy in complex real-world scenes.
    • Previous mixed adaptation models often exclude spatial complexity's impact.

    Purpose of the Study:

    • To investigate chromatic adaptation under spatially complex, dichromatic illumination.
    • To quantify the effect of spatial configuration on adaptation and equivalent illuminant chromaticity.
    • To propose a preliminary CAT model accounting for spatial and colorimetric complexity.

    Main Methods:

    • Conducted an achromatic matching experiment using simultaneous spatially dichromatic illumination.
    • Tested three illumination color pairs with various spatial configurations.
    • Analyzed the impact of spatial configuration on the degree of adaptation and equivalent illuminant chromaticity.

    Main Results:

    • Spatial configuration significantly influences chromatic adaptation.
    • The degree of adaptation varies with different spatial arrangements of dichromatic lighting.
    • Equivalent illuminant chromaticity is affected by spatial complexity.

    Conclusions:

    • Chromatic adaptation is influenced by the spatial complexity of illumination.
    • A preliminary CAT model incorporating spatial and colorimetric factors is proposed.
    • This research advances the understanding of color perception in complex visual environments.