In this paper, two psychophysical experiments were conducted to explore the effect of peak luminance on the perceptual color gamut volume. The two experiments were designed with two different image data rendering methods: clipping the peak luminance and scaling the image luminance to display's peak luminance capability. The perceptual color gamut volume showed a close linear relationship to the log scale of peak luminance. The results were found not consistent with the computational 3D color appearance gamut volume from previous work. The difference was suspected to be caused by the different perspectives between the computational 3D color appearance gamut volume and the experimental color gamut volume/perceptual color gamut volume.
Recently, people, who consume digital video or image, require more realistic digital contents. That's why HDR (High Dynamic Range) device is getting popular. HDR device captures and generates high dynamic range contents and display it to make the consumer feel more realistic. But, we have still problem, how to express legacy contents, which were captured and generated by LDR (Low Dynamic Range) devices, more realistic for LDR mobile display. In this paper, we propose a new method to express LDR contents more realistic in the mobile device. We proposed to increase peak-luminance for OLED using "Loading Effect" phenomenon. Analyzing visually important regions in the contents based on human visual perception, the luminance in those regions can be controlled easily. HDR contents can be converted more realistic in OLED display by proposed method.