ISSN:0361-2317    

DOI:10.1002/col.5080140302

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

年代:1989

数据来源: WILEY

ISSN:0361-2317    

DOI:10.1002/col.5080140303

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

年代:1989

数据来源: WILEY

ISSN:0361-2317    

DOI:10.1002/col.5080140304

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

年代:1989

数据来源: WILEY

摘要:

AbstractWe examined the effect of monochromatic adapting lights on minimally distinct border (MDB) settings and brightness matching (BM) between monochromatic test and reference fields by using three color‐normals and three deuteranopes as observers. In the case of MDB, for color‐normal observers chromatic adaptation appeared prominetly in the wavelength regions near the test and reference wavelengths in the corresponding field, when either the test or reference field was in the long‐wavelenth region. No differential effect was found for deuteranopic observers. Using BM instead of MDB, the differential effects of chromatic adaptation appeared more prominently in the short‐wavelength region for both types of observers (especially for color‐normals) and in the middle‐wavelength region for color‐normal observers. The results indicate that the blue‐sen‐sitive mechanisms make either little or no contribution to the MDB criterion, or the distin

ISSN:0361-2317    

DOI:10.1002/col.5080140305

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

年代:1989

数据来源: WILEY

摘要:

AbstractAn instrument was developed for the psychophysical measurement of color matching functions. The instrumental design centers around the use of lasers as the primary light sources. The three (RGB) laser beams are independently controlled with acousto‐optic modulators and projected into a diffuser for color mixing. The instrument was designed to allow for free viewing of the matching fields and versatility in the implementation of the matching fields and surround. To simplify data collection, a model was developed that allows the computation of the full spectral tristimulus functions based on just five visual matches. This model expresses color matching functions as linear transforms of the cone action spectra multiplied by variable transmittances of the lens and macula. The model was tested using the 2° color matching data of Stiles and Burch, and preliminary data were collected and modeled using the new instrume

ISSN:0361-2317    

DOI:10.1002/col.5080140306

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

年代:1989

数据来源: WILEY

摘要:

AbstractRadiometric properties of materials for lighting and building have to be known in the UV, visible, and IR regions of the spectrum. Radiometric and photometric properties can be measured with spectrometers independent of the spectral power distribution of the irradiating source used for measurement provided there is sufficient radiant energy available at all measured wavelengths. However, for luminescent materials a precise simulation of the reference illuminant has to be used for measurement, otherwise the measured characteristics are meaningless.

ISSN:0361-2317    

DOI:10.1002/col.5080140307

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

年代:1989

数据来源: WILEY

摘要:

AbstractA color‐difference dataset was developed for testing the performance of color metrics. The dataset comprises 45 color‐difference vectors varying in five directions at nine color centers under conditions typical of commercial color decisions. Probit analysis was used to estimate the parameters of the population distribution of tolerances for each vector. In addition to estimating the median tolerance, the anlysis allows one to estimate the uncertainty of a tolerance and to test the adequacy of the underlying model tolerance distribution. The median tolerances were used to specify 45 color‐difference pairs with equal visual color‐difference magnitudes. The performance of eight color‐difference metrics was compared using the normalized standard deviation of the color differences of the visually equal difference pairs as a measure of uniformity. A bootstrap statistical technique was used to quantify the variation in performance with varying samples of color centers and color‐difference directions and to determine the significance of observed differences in uniformity performance. Some metrics based on weighted CIELAB dl*, dC*, dH* color‐difference components had significantly superior performance compared to the CIE recommended color‐dif

ISSN:0361-2317    

DOI:10.1002/col.5080140308

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

年代:1989

数据来源: WILEY

摘要:

AbstractMacLeod and Boynton started off with the assumption that the fundamental blue falls on the x' axis of Judd's 1951 chromaticity diagram. This leads to a constant luminance diagram in which the lines that converge at the fundamental blue in Judd's diagram are parallel. MacLeod and Boynton tried to solve this problem by a slight change in one of the constants in the transformation equations. It turns out that what this does is to shift the position of the alychne on Judd's diagram so that it does not coincide with the x' axis. The blue fundamental no longer lies on the alychne. This makes it possible to derive a constant luminance chromaticity diagram in which the fundamental blue falls at one of the corners. After having created this new diagram, they used it to formulate a theory of color vision in which the blue cones contribute nothing to luminance. This procedure needs to be understood because it can be used to convert any theory of color vision in which all three cones contribute to luminance to one in which only two contribute to luminance. This has nothing to do with having the blue fundamental fall on the x' axis. A more serious problem is that Judd has made an error in his assessment of the luminosity coefficients and the concepts of MacLeod and Boynton need to be reformulated in terms of the CIE 1931 chromaticity diagram.

ISSN:0361-2317    

DOI:10.1002/col.5080140309

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

年代:1989

数据来源: WILEY

ISSN:0361-2317    

DOI:10.1002/col.5080140310

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

年代:1989

数据来源: WILEY

ISSN:0361-2317    

DOI:10.1002/col.5080140311

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

年代:1989

数据来源: WILEY