Uniformities in OSA-UCS and in NCS tested by color difference prediction based on principal hue components

Tarow Indow

doi:10.1117/12.464507

6 June 2002 Uniformities in OSA-UCS and in NCS tested by color difference prediction based on principal hue components

Tarow Indow

Proceedings Volume 4421, 9th Congress of the International Colour Association; (2002) https://doi.org/10.1117/12.464507
Event: 9th Congress of the International Color Association, 2001, Rochester, NY, United States

Abstract

The OSA uniform color system is a 3-D collection of color samples according to the regular rhombohedral structure in which each color is surrounded by its 12 nearest neighbors, all perceptually equally different (local uniformity). The Swedish NCS system is a 3-D collection of color samples that vary gradually in each of the three perceptual attributes. It is not clear that this arrangement implies all neighboring pairs along the respective coordinates being perceptually equally different (local uniformity). Of pairs (j,k) of interest, predicted color differences d_jk were calculated that have the following property. Suppose an observer selects a pair of Munsell grays (V_a, V_b) that matches in size with the color difference between (j,k), then d_jk=|V_a-V_b| is predicted by d_jk, on the average, with error of 0.34 in Munsell V-unit. Variation of d_jk in this unit was in the order of 0.22V for nearest neighboring pairs (j,k) in various cleavage planes of OSA-UCS and in the order of 0.11V for neighboring pairs (j,k) along s-coordinate and c-coordinate in sheets with fixed hue of NCS. Both were well within the prediction error range, but some systematic trends in values of d_jk were found.

Citation Download Citation

Tarow Indow "Uniformities in OSA-UCS and in NCS tested by color difference prediction based on principal hue components", Proc. SPIE 4421, 9th Congress of the International Colour Association, (6 June 2002); https://doi.org/10.1117/12.464507

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