IX CONGRESO NACIONAL DEL COLOR - Publicaciones de la ...

IX CONGRESO NACIONAL DEL COLOR. ALICANTE 2010
number of colors for indoor scenes
x 104
3
2.5
2
1.5
0.4 0.45 0.5 0.55
spectral distance
0.6 0.65
Figure 4. Number of colour s produced in a set of indoor scenes expressed as a function of the spectral distance to
the illuminant E for a selection of metamers of a Planckian radiator with a colour temperature of 6500 K.
CONCLUSIONS
We found that, in general, CRI decreases as the spectral structured of the illuminant
increases, that is, as it becomes less uniform. Contrasting with this result, larger values of CDI
could only be obtained with illuminants with a small number of non-zero spectral bands, that is,
with highly structured spectra. For indoor scenes, the maximum number of discernible colours
was also obtained for highly structured spectra. Highly structured illuminants produce larger
chromatic diversity than more uniform spectrum and may therefore be best for applications where
maximization of chromatic diversity is important.
ACKNOWLEDGMENTS
This work was supported by the Centro de Física of Minho University, Braga, Portugal, and
by the Fundação para a Ciência e a Tecnologia (grant PTDC/EEA-EEL/098572/2008). João
M.M. Linhares was supported by grant SFRH/BD/35874/2007 and Paulo E.R. Felgueiras by
grant SFRH/BD/44698/2008.
REFERENCES
[1]. E. Mahler, J. J. Ezrati, and F. Vienot, "Testing LED Lighting for Colour Discrimination and Colour
Rendering," Color Research and Application 34, 8-17 (2009).
[2]. CIE, "Colour rendering, TC 1-33 closing remarks," Publ. CIE 135(1999).
[3]. F. Martinez-Verdu, E. Perales, E. Chorro, D. de Fez, V. Viqueira, and E. Gilabert, "Computation and
visualization of the MacAdam limits for any lightness, hue angle, and light source," Journal of the Optical
Society of America a-Optics Image Science and Vision 24, 1501-1515 (2007).
[4]. M. S. Rea and J. P. Freyssinier-Nova, "Color rendering: A tale of two metrics," Color Research and
Application 33, 192-202 (2008).
[5]. F. J. M. Schmitt, "Method for Treatment of Metamerism in Colorimetry," Journal of the Optical Society of
America 66, 601-608 (1976).
[6]. Munsell Color Corporation, Munsell Book of Color-Matte Finish Collection (Munsell Color Corporation,
Baltimore, MD, 1976).
[7]. U. o. J. C. Group, "Spectral Database," (http://spectral.joensuu.fi/).
[8]. J. M. M. Linhares, P. A. Pinto, and S. M. C. Nascimento, "Chromatic diversity index – an approach based on
natural scenes," Proceedings of CGIV2010 (2010).
[9]. D. H. Brainard, "Hyperspectral Image Data" ( http://color.psych.ucsb.edu/hyperspectral/, 1997), retrieved.
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