Abstract
Abstract
The present study investigates the effect of the fundamental six-colour (cyclic) sequence on human colour impression. The different effects of two spatial sequences are investigated under the consideration of a hexagonal diagram that is a projection of RGB colour space from white to black. The hexagonal diagram corresponds roughly to the hue circle indicated by both hue and saturation in an HLS system. The projected route area indicates the magnitude of naturalness (as in rainbows) for colour sequences. The minimum sequence is similar to the order of colours in rainbows, whereas the non-minimum sequence is completely different. Therefore, a human colour impression model is proposed using the projected route area indicated by both hue and saturation. It is clarified that the majority of subjects of nearly all ages has a natural impression when the minimum route area is large. In addition, the human colour impression is compared with the human colour impression model. This model is intended to be employed in order to design commodities, goods, buildings, and towns to have the most effective colour sequence.
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