Recent experiments investigating the harmony interval based colour space of the Coloroid Colour System

Coloroid Colour System has been created for people dealing with colours constructively, first of all architects and artists. Its colour space is being based on experiments measuring harmony threshold, being perceptively uniform. This uniformity is the uniformity of big colour differences rather than that of small colour differences, it is being based on human judgement capability rather than colour differentiating capability of human eye. During its elaboration we have investigated aesthetic uniformity of hues along colour circles of colours with different saturation and lightness, and - in different hue planes - that of saturation and lightness sequences. During mathematical formulation of the establishment of harmony relations in Coloroid colour space it has been necessary to refine aesthetic uniformity of Coloroid colour space. In the interest of it we have started a new, large scale series of experiments. Within the framework of experiments we produced aesthetically uniform changing scales between distant points of Coloroid colour space, possessing different lightness - partly by painting, partly by selection from a considerable number of colour samples. We then investigated, which path those colour scales in the colour space describe.