ISSN:0361-2317    

DOI:10.1002/col.5080120202

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1987

数据来源: WILEY

ISSN:0361-2317    

DOI:10.1002/col.5080120203

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1987

数据来源: WILEY

摘要:

AbstractThis article describes the steps that should be considered for the proper illumination of artwork. In particular, our intent is to show how a different illuminating environment from one intended by the artist affects the color appearance of exhibited paintings. Using five different illuminants and several illumination levels, it is shown for eight artists' pigments that large color‐appearance differences occur. This is true even after the effects of chromatic adaptation are taken into accoun

ISSN:0361-2317    

DOI:10.1002/col.5080120204

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1987

数据来源: WILEY

摘要:

AbstractWe describe the types of threshold measurement that can be made by using a circular test spot whose colorimetric, temporal, and spatial parameters can be varied. Examples are given of the application of a number of these tests to studies of normal and clinical vision.

ISSN:0361-2317    

DOI:10.1002/col.5080120205

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1987

数据来源: WILEY

摘要:

AbstractThe retinex theory of Dr. Edwin Land is once again generating considerable interest among colour‐vision scientists. This theory attempts to explain by a few simple laws the phenomenon of colour constancy, i.e., the fact that the perceived hue of objects remains almost constant, despite large changes in the wavelength composition and average intensity of the source illuminating them. Recently the theory was the subject of a symposium and lecture delivered by Dr. Land to the Bavarian Academy of Sciences in Munich. This article summarizes that lecture and symposium and discusses the retinex theory in the context of some recent finding

ISSN:0361-2317    

DOI:10.1002/col.5080120206

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1987

数据来源: WILEY

摘要:

AbstractSpectral curves of metameric colors intersect at least three times in the visible spectral range. Based on studies on the variation of intersection wavelengths with the degree of metamerism, it has been found that the intersections tend to converge more closely to three particular wavelengths as the object colors become more strongly metameric.

ISSN:0361-2317    

DOI:10.1002/col.5080120207

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1987

数据来源: WILEY

摘要:

AbstractVos demonstrated that the Judd 1951 color‐mixture diagram is a projective transformation of the CIE 1931 mixture diagram. He has provided transformation formulas for computing values ofx′andy′fromxandy, but he does not explain how the one set of data is derived from the other. Neither does Judd. Judd wanted the CIE to replace the 1931V(Λ) curve with a newV(Λ) curve and to replace the 1931XYZdiagram with a newX′Y′Z′diagram. I have assumed that Judd started with the CIE 1931RGBdiagram. HisX′Y′Z′diagram can be derived from theRGBdiagram if we use a different set of luminosity coefficients than those specified by the CIE. This change in luminosity coefficients was no doubt intended to compensate for the use of a newV(Λ) curve, but Judd has ignored the effect that this change in the luminosity coefficients should have on the alychne of theRGBdiagram and the locus of spectral colors. This makes Judd'sX′Y′Z′diagram inappropriate for use in colorimetry and for use in building color‐vision models. I have proposed a

ISSN:0361-2317    

DOI:10.1002/col.5080120208

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1987

数据来源: WILEY

摘要:

AbstractThe color specimens developed by the OSA Committee on Uniform Color Scales are intended to provide a uniform sampling of the three‐dimensional domain of realizable surface colors. The research of this article confirms the distinction between basic and nonbasic color terms and defines the locations of the eleven basic surface colors within the OSA space through systematic, monolexemic color naming of 424 samples of the OSA set seen against a gray background. It is concluded that the coordinate system of the OSA color space is well suited to the specification of color order: The locations of the basic colors are reasonably arranged and can be conveniently and precisely visualize

ISSN:0361-2317    

DOI:10.1002/col.5080120209

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1987

数据来源: WILEY

摘要:

AbstractThe Saunderson correction used in turbid‐medium calculations applies only to opaque films. If the film is translucent and free standing, we must use a more comprehensive equation that takes both transmission and reflection into account. The Saunderson correction is valid, however, if the translucent film is laid over an opaque substrate and viewed by reflection onl

ISSN:0361-2317    

DOI:10.1002/col.5080120210

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1987

数据来源: WILEY

ISSN:0361-2317    

DOI:10.1002/col.5080120211

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1987

数据来源: WILEY