Mr. David Geisler-Moroder Profile

David Geisler-Moroder

at Univ Innsbruck

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Publications (2)

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SPIE Journal Paper | 1 October 2009

Color-rendering indices in global illumination methods

David Geisler-Moroder, Arne Dür

JEI, Vol. 18, Issue 04, 043015, (October 2009) https://doi.org/10.1117/12.10.1117/1.3274623

KEYWORDS: Light sources, RGB color model, Lamps, Light emitting diodes, Colorimetry, Color difference, Light sources and illumination, Reflection, Light, Skin

Read Abstract +

Human perception of material colors depends heavily on the nature of the light sources that are used for illumination. One and the same object can cause highly different color impressions when lit by a vapor lamp or by daylight, respectively. On the basis of state-of-the-art colorimetric methods, we present a modern approach for the calculation of color-rendering indices (CRI), which were defined by the International Commission on Illumination (CIE) to characterize color reproduction properties of illuminants. We update the standard CIE method in three main points: first, we use the CIELAB color space; second, we apply a linearized Bradford transformation for chromatic adaptation; and finally, we evaluate color differences using the CIEDE2000 total color difference formula. Moreover, within a real-world scene, light incident on a measurement surface is composed of a direct and an indirect part. Neumann and Schanda [Proc. CGIV'06 Conf., Leeds, UK, pp. 283-286 (2006)] have shown for the cube model that diffuse interreflections can influence the CRI of a light source. We analyze how color-rendering indices vary in a real-world scene with mixed direct and indirect illumination and recommend the usage of a spectral rendering engine instead of an RGB-based renderer for reasons of accuracy of CRI calculations.

Proceedings Article | 10 February 2009 Paper

Color rendering indices in global illumination methods

David Geisler-Moroder, Arne Dür

Proceedings Volume 7240, 72401F (2009) https://doi.org/10.1117/12.805608

KEYWORDS: RGB color model, Light sources, Light emitting diodes, Lamps, Colorimetry, Color difference, Light sources and illumination, Reflection, Radium, Light

Read Abstract +

Human perception of material colors depends heavily on the nature of the light sources used for illumination. One and the same object can cause highly different color impressions when lit by a vapor lamp or by daylight, respectively. Based on state-of-the-art colorimetric methods we present a modern approach for calculating color rendering indices (CRI), which were defined by the International Commission on Illumination (CIE) to characterize color reproduction properties of illuminants. We update the standard CIE method in three main points: firstly, we use the CIELAB color space, secondly, we apply a Bradford transformation for chromatic adaptation, and finally, we evaluate color differences using the CIEDE2000 total color difference formula. Moreover, within a real-world scene, light incident on a measurement surface is composed of a direct and an indirect part. Neumann and Schanda1 have shown for the cube model that interreflections can influence the CRI of an illuminant. We analyze how color rendering indices vary in a real-world scene with mixed direct and indirect illumination and recommend the usage of a spectral rendering engine instead of an RGB based renderer for reasons of accuracy of CRI calculations.

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