Two experimental data sets were accumulated for evaluating colour differences under a wide range of luminance levels using the printed colours in a spectrum tuneable viewing cabinet and self-luminous colours on a display respectively. For the surface mode experiment, pairs of samples were assessed at 9 phases ranged from 0.25 to 1128 cd/m2. For the luminous mode experiment, it was conducted in 6 phases ranged from 0.25 to 279 cd/m2. There were 140 and 42 pairs of samples judged by 20 observers using a sixcategory scales for each phase. The results were used to establish the just noticeable difference (JND) at each luminance level and showed a great agreement between two modes of colours. These were used to test the performance of 5 uniform colour spaces and colour difference equations. Also, the spaces or equations were extended to improve the fit to the present data sets.
Qiang Xu, Guihua Cui, Muhammad Safdar, Lihao Xu, Ming Ronnier Luo, Baiyue Zhao, "Assessing Colour Differences under a Wide Range of Luminance Levels Using Surface and Display Colours" in Proc. IS&T 27th Color and Imaging Conf., 2019, pp 355 - 359, https://doi.org/10.2352/issn.2169-2629.2019.27.64