1996 Fiscal Year Final Research Report Summary
Measurement of constant hue loci in red and green regions
| Project/Area Number |
07650043
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Applied optics/Quantum optical engineering
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| Research Institution | Utsunomiya University |
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Principal Investigator |
NAKATSUE Miyoshi Utsunomiya Univ.Dept.of Infor.Sci.Assoc.Prof., 工学部, 助教授 (30251078)
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| Project Period (FY) |
1995 – 1996
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| Keywords | constant hue loci / color appearance / self-luminous mode / surface mode / opponent color / color naming |
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| Research Abstract |
It has been reported that the constant hue locus of unique red for colored light plotted on the CIE (x, y) -chromaticity diagram is quite different from the constant hue loci of the Munsell 5R and NCS R not only its location but also the direction of the curvature, while the constant hue loci of other unique hues for light sources generally agree with those of the corresponding hues of Munsell and NCS systems. To our knowledge, no study has been done to investigate the inconsistency particularly observed in the red region. Possible causes are the deviations of Munsell 5R and NCS R from a perceptual unique red, the difference of an experimental procedure between the studies for light source and color chart, the individual differences among the observers in the separate studies, or the difference of appearance mode between self-luminous and surface colors. Thus we measured the hue color stimuli presented in a surface color mode (real color charts and CRT color stimuli with gray surround) and in a self-luminous mode (CRT color stimuli with dark surround) using two kinds of color naming technique, an opponent color type, and a categorical type, for the same observers using the same experimental procedure. The results of six observers showed that the average unique red locus in the color chart experiment does not coincide with that in the CRT with dark surround condition. The difference is similar to the tendency observed in the previous studies. Therefore it is suggested that the mode of appearance is the most effective cause for the shift and change of shape of the unique red locus on the chromaticity diagram.
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