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Carreño Sánchez, Fernando Zoido Chamorro, Jesús Manuel 2023-06-20T20:27:01Z 2023-06-20T20:27:01Z 2001-10 0361-2317 10.1002/col.1051 https://hdl.handle.net/20.500.14352/60293 http://dx.doi.org/10.1002/col.1051 http://onlinelibrary.wiley.com/doi/10.1002/col.1051/full We present a discussion about the influence of luminance on the geometry of color-difference thresholds. By assuming that color matchings are normally distributed in XYZ space, we have shown [Appl Opt 38:208–219 (1999)] that the probability density function of color matches in (x, y, Y) space is not a normal distribution function and it is an asymmetric one. Due to this asymmetry, the curves of equally noticeable chromaticity differences show asymmetries around the color center. The influence of luminance on the shape of these curves is analyzed, and we conclude that the lower the luminance, the larger the asymmetry. eng restricted access The influence of luminance on color-difference thresholds journal article