September 2011
Volume 11, Issue 11
Vision Sciences Society Annual Meeting Abstract  |   September 2011
Optimizing lighting spectra for naturalness and chromatic diversity
Author Affiliations
  • Osamu Masuda
    Center of Physics, University of Minho, Portugal
  • João Linhares
    Center of Physics, University of Minho, Portugal
  • Paulo Felgueiras
    Center of Physics, University of Minho, Portugal
  • Sérgio Nascimento
    Center of Physics, University of Minho, Portugal
Journal of Vision September 2011, Vol.11, 350. doi:
  • Views
  • Share
  • Tools
    • Alerts
      This feature is available to authenticated users only.
      Sign In or Create an Account ×
    • Get Citation

      Osamu Masuda, João Linhares, Paulo Felgueiras, Sérgio Nascimento; Optimizing lighting spectra for naturalness and chromatic diversity. Journal of Vision 2011;11(11):350.

      Download citation file:

      © ARVO (1962-2015); The Authors (2016-present)

  • Supplements

The naturalness and diversity of colors produced by a light source are important aspects of color rendering which are often difficult to reconcile with conventional illumination. With the advent of modern solid-state light sources almost any lighting spectrum is possible and a new wide range of possibilities for color rendering is available. What spectral profiles optimize these two aspects? We addressed this issue by studying computationally chromatic effects of a variety of light sources with arbitrary spectral distributions. A large number of chromaticity points were chosen around the Planckian locus ranging from 2,000 K – 20,000 K, and for each point a large set of metamers with variable degree of smoothness was generated using the Schmitt's elements method. The general color rendering index (CRI) and the volume of the Munsell set spanned in the CIELAB color space were calculated for each metamer. Consistently with previous findings obtained with smaller samples, the metamers with the maximum CRI at each chromaticity had smooth spectra and the metamers producing the maximum volume of the Munsell set had more structured spectrum. The product of CRI and volume of the Munsell set showed a regular variation in color space and was maximized for chromaticities in the yellow-green region and for spectra medium structured. Similar tendency was obtained with the product of CRI by the number of discernible colors in high-resolution hyperspectral images of 50 natural scenes illuminated by these metamers. In these optimal conditions CRI above 90 could be obtained. The present study shows that it is possible to reconcile chromatic naturalness and chromatic diversity in color rendering by optimizing the spectra and the chromaticities of lighting.

Fundação para a Ciência e a Tecnologia (PTDC/EEA-EEL/098572/2008). 

This PDF is available to Subscribers Only

Sign in or purchase a subscription to access this content. ×

You must be signed into an individual account to use this feature.