ISSN:0361-2317    

DOI:10.1002/col.5080110102

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

年代:1986

数据来源: WILEY

ISSN:0361-2317    

DOI:10.1002/col.5080110103

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

年代:1986

数据来源: WILEY

ISSN:0361-2317    

DOI:10.1002/col.5080110104

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

年代:1986

数据来源: WILEY

ISSN:0361-2317    

DOI:10.1002/col.5080110105

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

年代:1986

数据来源: WILEY

摘要:

AbstractAn improved quantitative description of the equidistant color and lightness spacing of the Munsell and OSA‐UCS Systems is presented. The basic idea is to apply physiologically acceptable hyperbolic response functions to relate light absorption in and the excitation of the three cone types with visual response. A similar nonlinear equation describes the relationship between the luminance factor Y and a lightness magnitude. Subsequent linear combinations of the nonlinear functions describe opponent‐color transformations. The resulting formulation, called the SVF formula, is superior to the best available empirical formulae, such as CIELAB and CIELUV, in describing the Munsell color space, and it performs even better than the OSA L g j formula on the OSA‐UCS

ISSN:0361-2317    

DOI:10.1002/col.5080110106

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

年代:1986

数据来源: WILEY

摘要:

AbstractAvailable colour‐discrimination data for surface colours have been analysed to produce chromaticity‐discrimination ellipses for individual colour centres. Applying simulated errors showed that when the distribution of samples around a standard was unsatisfactory, the ellipses obtained were unreliable. A total of 132 reliable ellipses were obtained. The values of 6 and a/b varied systematically over the chro‐maticity diagram, the patterns from acceptability, perceptibility, textile, and non‐textile ellipses being very similar. New experimental data involving over 400 pairs of samples corresponding to 70 of the colour centres and assessed against a grey scale were used to adjust the relative sizes of the ellipses. Overall set factors were used to bring data from different sources onto a common scale. However, even after allowing for different lightness levels, the sizes of the ellipses still appeared to be irregular. Using the new results to adjust the sizes of the individual ellipses from any one group of data, e.g., BFD, DF, or MMB, gave ellipses forming a much more regular pattern. In contrast to the MacAdam ellipses, the smallest ellipses occurred in the blue‐grey region. Our results imply that the relative sizes of the ellipses from the same group of data are in error by a factor of two or more. Comparing colour differences for different colours appears to be much more difficult than has been previously realised. The problem appears to have affected all the major groups of publi

ISSN:0361-2317    

DOI:10.1002/col.5080110107

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

年代:1986

数据来源: WILEY

摘要:

AbstractColor measurements were carried out in September, 1981, and again in January, 1982, on a total of 102 color zones in 12 different figures in the polychromatic roof of the Paintings Room of the Altamira Cave. The comparative study was carried out to evaluate any seasonal variations in reflectance and color between these two months, in which the humidity of the rock base for the paintings differs widely. No differences outside of experimental error were found.

ISSN:0361-2317    

DOI:10.1002/col.5080110108

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

年代:1986

数据来源: WILEY

摘要:

AbstractThe field of colorimetry appears to be arbitrarily divided into two areas, matching‐and‐formulation colorimetry and image‐reproduction colorimetry. It is believed that the end uses for the colorimetric data and the methods of color generation are sufficiently different in these two areas to warrant this division. Conditions that contribute to this division are the need for metamerism and the use of limited sets of primaries in reproduction work, the compromise of lightnesses due to tone reproduction, the availability and proper use of instrumentation compared to that desired, and the viewing conditions of the standard observer. All these contribute to produce significantly larger color differences in image‐reproduction work than in matching and formulation. However, workers in reproduction studies can still draw useful conclusions when these conditions are properly und

ISSN:0361-2317    

DOI:10.1002/col.5080110109

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

年代:1986

数据来源: WILEY

摘要:

AbstractA color order system may arrange color perceptions, color stimuli, or material color samples according to certain rules. Material color systems have many practical applications but are different for different materials and different applications. Stimulus systems are useful in comparing instrumental measurements of transmitted or reflected radiation, but do not adequately describe the appearance of the color perceptions. In most perceptive color systems attributes like hue, saturation, and lightness (or their near correlates) describe three‐dimensional color space. There are two main exceptions: the OSA–UCS system intended to be equidistant in all directions of color space, and the NCS, which is a Hering‐type opponent system, based on six innate elementary colors with six corresponding attributes. In the NCS, hue and chromaticness, which in other systems are primary attributes, are derived from the elementary attri

ISSN:0361-2317    

DOI:10.1002/col.5080110110

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

年代:1986

数据来源: WILEY

摘要:

AbstractA new methodology and a supporting algorithm to determine high‐contrast sets of colors for use on a color CRT are described. The method is unique in that the generated colors not only are highly contrasting, but are also ergonomically optimal. Using real data, the performance of the present method is compared to an extended version of the Carter and Carter algorithm. Finally, an integrated methodology is discussed. The latter methodology could simultaneously determine optimal phosphor luminances and chromaticities, as well as optimal values for the ambient chromaticit

ISSN:0361-2317    

DOI:10.1002/col.5080110111

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

年代:1986

数据来源: WILEY