Fig. 1. Color chromaticity diagram of a tennis ball and its partial enlargement

Fig. 2. Comparison of the same image displayed on HDTV and UHDTV

Fig. 3. Prediction of the popularity of wide color gamut display devices from 2015 to 2023

Fig. 4. CIE 1931 RGB color mixing curves

Fig. 5. CIE 1931 xy chromaticity diagram of the standard color gamut, Pointer color gamut, and a variety of wide color gamut standards

Fig. 6. Imaging and color difference comparison of RGB, CMY, and RGBCY^［36］. (a) Ground truth; (b) RGBCY imaging; (c) RGB imaging; (d) CMY imaging; (e) ground truth color difference; (f) RGBCY color difference; (g) RGB color difference; (h) CMY color difference

Fig. 7. Display and sub-pixel structure of RGB and RGBY. (a) Conventional RGB; (b) four-primary-color RGBY

Fig. 8. Color generation of the spatiotemporal four-primary-color approach^[31]

Fig. 9. RGB, RGBCY, and RGBCMY color filter arrays. (a) RGB; (b) RGBCY; (c) RGBCMY RGB:CMY=1∶1; (d) RGBCMY RGB∶CMY=3∶1