Effect of gamut expansion of object colours on a simulated six- primary display

This paper evaluates the gamut expansion ratio on a six-primary display by conducting a psychophysical experiment involving real objects. However, no six-primary display was used in this article; it was based on the simulated and virtual RGBCMY display. We first introduce the algorithm for simulating the six-primary display that consists of three stages: (1) colour separation, (2) code condensation, and (3) white point estimation. To ensure that we identify the most suitable gamut expansion ratio for the human perception of the colours of objects, our experiments featured pineapple, loquat, wax apple, peach, plum, carambola, and guava fruits through saturated colours on a monitor. Subjects were asked to identify their preferences for the colours that they observed. Our results show that the most suitable perception range for real objects is from 1.2 to 1.4.