TY - JOUR
T1 - Models of colour quality over a wide range of spectral power distributions
AU - Esposito, T.
AU - Houser, K.
N1 - Publisher Copyright:
© The Chartered Institution of Building Services Engineers 2018.
PY - 2019/5/1
Y1 - 2019/5/1
N2 - Twenty-four real spectra were strategically structured to have systematic variation in average fidelity (IES Rf = 65, 75, 85, 95), average gamut (IES Rg = 80, 90, 100, 110, 120) and gamut shape (nominally saturating or desaturating red colour evaluation samples), at 3500 K. For each spectrum, 20 participants rated a set of objects along continuous scales of naturalness, preference, vividness and skin preference. Most of the top rated spectra, along all four scales, had average gamut greater than or equal to 100 (IES Rg ≥ 100) and did not desaturate red hues (IES Rcs,h16 ≥ 0%). Best fit models illustrate that average fidelity (i.e. IES Rf) and a proxy for red saturation (i.e. IES Rcs,h16, Rcs,h1) are salient derived measures. The results illustrate that a two-metric system of colour rendition, comprised of average metrics for fidelity and gamut, cannot fully describe colour quality and underscore the importance of a colour rendering graphic (i.e. IES Colour Vector Graphic). We propose and illustrate the utility of quantifying the shape of the IES TM-30-15 Color Vector Graphic with a best-fit ellipse.
AB - Twenty-four real spectra were strategically structured to have systematic variation in average fidelity (IES Rf = 65, 75, 85, 95), average gamut (IES Rg = 80, 90, 100, 110, 120) and gamut shape (nominally saturating or desaturating red colour evaluation samples), at 3500 K. For each spectrum, 20 participants rated a set of objects along continuous scales of naturalness, preference, vividness and skin preference. Most of the top rated spectra, along all four scales, had average gamut greater than or equal to 100 (IES Rg ≥ 100) and did not desaturate red hues (IES Rcs,h16 ≥ 0%). Best fit models illustrate that average fidelity (i.e. IES Rf) and a proxy for red saturation (i.e. IES Rcs,h16, Rcs,h1) are salient derived measures. The results illustrate that a two-metric system of colour rendition, comprised of average metrics for fidelity and gamut, cannot fully describe colour quality and underscore the importance of a colour rendering graphic (i.e. IES Colour Vector Graphic). We propose and illustrate the utility of quantifying the shape of the IES TM-30-15 Color Vector Graphic with a best-fit ellipse.
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U2 - 10.1177/1477153518765953
DO - 10.1177/1477153518765953
M3 - Article
AN - SCOPUS:85045296683
SN - 1477-1535
VL - 51
SP - 331
EP - 352
JO - Lighting Research and Technology
JF - Lighting Research and Technology
IS - 3
ER -