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Dive into the research topics where James A. Worthey is active.

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Featured researches published by James A. Worthey.


Journal of the Optical Society of America | 1982

Opponent-colors approach to color rendering

James A. Worthey

Starting with an opponent-colors formulation of color vision, two parameters, t and d, may be defined that express an illuminants ability to realize red-green and blue-yellow contrasts of objects. For instance, calculation of t and d for daylight shows that on a gray day, color contrasts are actually reduced. By these measures, many common vapor-discharge illuminants systematically distort object colors. Because red-green contrasts contribute to border distinctness, and both types of color contrast contribute to brightness, such systematic distortions probably affect the overall clarity and brightness of what is perceived visually, Experimental data are consistent with this idea. In relation to color-constancy (retinex) experiments, it is approximately true that the visual system discounts the color of an illuminant but not its t and d.


Journal of the Optical Society of America | 1982

Refinements of formulas for receptor sensitivity

James A. Worthey; David F. Neri

When it is desired to fit a polynomial to a function of wavelength, roundoff errors may be minimized by shifting the origin of the independent variable (wavelength or frequency) to the center of the region of interest.


Journal of The Illuminating Engineering Society | 1985

Visual Clarity With A Black-And-White Scene.

James A. Worthey

Visual clarity experiments are usually done with colorful test objects, and it is generally concluded that the results of such experiments are related to the color-rendering properties of the illuminants involved. Nonetheless, it has been observed that a clarity difference between illuminants may be seen, even with black-and-white objects. An experiment was performed to measure differences of perceived clarity using only black-and-white fabric and black yarn as test objects. (The word “clarity” was not used in the instructions to subjects. They were asked questions concerning “preferences” and “blackness.”) The differences measured seem to indicate a role for color in black-and-white vision, but not a pure clarity effect independent of illuminant color.


Journal of the Optical Society of America | 1985

Limitations of color constancy

James A. Worthey


Color Research and Application | 2004

Principal components applied to modeling: Dealing with the mean vector

James A. Worthey; Michael H. Brill


Journal of The Illuminating Engineering Society | 1985

An Analytical Visual Clarity Experiment

James A. Worthey


Journal of The Illuminating Engineering Society | 1990

Lighting Quality and Light Source Size

James A. Worthey


Journal of The Illuminating Engineering Society | 1987

Geometry and Amplitude of Veiling Reflections

James A. Worthey


Color Research and Application | 2007

Color matching functions when one primary wavelength is changed

Michael H. Brill; James A. Worthey


Journal of The Illuminating Engineering Society | 1989

Effect of Veiling Reflections on Vision of Colored Objects

James A. Worthey

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David F. Neri

Naval Submarine Medical Research Laboratory

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