Commission International Eclairage (CIE) developed several mathematical methods to predict colour rendering of lighting source, as well visual attributes of materials, but are only an approximation of the material appearance: too many parameters of influence, subjects expectancy included, influence the appearance. In artwork exhibition visual appearance is of fundamental importance and currently no reliable and robust appearance model is available. Comparing objective evaluations and subjective results for lighting set up comparable to works of art exhibition, will provide useful indications on the applicability of colorimetric calculation to artwork exhibition when LED are involved.
Visual attributes (hue, saturation, brightness…) of six different colours under LED and not-LED sources at the same Correlate Colour Temperature were compared to the associate objective characteristics calculated from the spectral reflectance.
The results show that the perception of visual attributes differs from objective data when SSL sources are involved and when colours are perceived in complex samples: in some cases the visual system is not coherent with the suggestions arising from the calculations.