Colour preference, naturalness, vividness and colour quality metrics, Part 1: Experiments in a room

In Part I of this work, observers scaled colour preference, naturalness and vividness visually on interval scales (0-100) labelled by semantic categories (e.g. 'moderate', 'good' and 'very good') in the context of office lighting. Five customary light sources without object saturation effect illuminated a table with coloured objects in a real room. The observers' assessments were predicted by recent colour quality indices and selected pairs of indices combined linearly. Criterion values of the indices for 'good' colour preference and vividness were determined to provide a usable acceptance limit for the spectral design and evaluation of light sources. To predict colour preference, correlated colour temperature turned out to be useful. In Part 2 of this work, another experiment with the same method but using multi-LED spectra with more object saturation will be analysed and the two datasets will be merged.