Fig. 1. Molar extinction coefficient spectra of various skin tissue components in visible light band

Fig. 2. Spectral power distribution of CIE D65 light source and color matching function in CIEXYZ space

Fig. 3. Effect of volume of chromophores in skin on diffuse reflectance spectrum. (a) Effect of changes in blood volume fraction on diffuse reflectance spectrum; (b) effect of volume fraction of melanin on diffuse reflectance spectrum

Fig. 4. Effect of total hemoglobin concentration and blood oxygen saturation on diffuse reflectance spectrum. (a) Effect of total hemoglobin concentration on diffuse reflectance spectrum; (b) effect of blood oxygen saturation on diffuse reflectance spectrum

Fig. 5. Effect of nonfunctional hemoglobin concentration on diffuse reflectance spectrum. (a) Effect of methemoglobin concentration on diffuse reflectance spectrum; (b) effect of sulfhemoglobin concentration on diffuse reflectance spectrum

Fig. 6. Effect of bilirubin concentration on diffuse reflectance spectrum

Fig. 7. Skin color with different peripheral blood volume and melanin volume

Fig. 8. Skin color at different hemoglobin concentrations

Fig. 9. Skin color at different oxygen saturation levels. (a) Skin colour at different oxygen saturation levels at 2% of blood volume; (b) skin color at different oxygen saturation levels at 7% of blood volume

Fig. 10. Skin color at different nonfunctional hemoglobin concentrations. (a) Skin color at different methemoglobin concentrations; (b) skin color at different sulfhemoglobin concentrations

Fig. 11. Skin color at different bilirubin concentrations

Fig. 12. Distribution of skin color in color space under different skin tissue parameters. (a) Distribution of normal skin color in color space; (b) distribution of cyanosis in color space; (c) distribution of jaundiced skin color in colour space; (d) distribution of normal skin color and abnormal skin color in color space

Fig. 13. Skin color with cyanosis caused by abnormal oxygen saturation, abnormal methemoglobin concentration, and abnormal sulfur hemoglobin concentration and corresponding diffuse reflectance spectrum

Table 1. Simulation parameter of skin