Chapter 7

Eric Dubois
Multidimensional Signal and Color Image Processing Using Lattices

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Chapter 7 Light and Color Representation in Imaging Systems

MATLAB code for figures and examples

Fig. 7.1 Power density of various light sources shown in the figure, and a few extras.

MATLAB script: mdsp_web_col_spectra.m
Output preview: fig7.1a.png; fig7.1b.png;fig7.1c.png;fig7.1d.png

Fig 7.2 Spectral transmission and relection curves.

MATLAB script: mdsp_web_col_plot_absorption_reflectance.m
Output preview: fig7.2a.png; fig7.2b.png

Fig. 7.3 Spectral densities of two lights that appear as the same medium pink color to a normal trichomatic human viewer.

MATLAB script: mdsp_web_col_plot_metamers.m
Output preview: fig7.3.png

Fig. 7.4 Color matching functions of the CIE 1931 RGB primaries, monochromatic lights at wavelengths 700.0 nm, 546.1 nm and 435.8 nm respectively

MATLAB script: mdsp_web_col_plot_ciergbcmf.m
Output preview: fig7.4.png

Fig. 7.5 Color matching functions of the CIE 1931 XYZ primaries.

MATLAB script: mdsp_web_col_plot_xyzcmf.m
Output preview: fig7.5.png

Fig. 7.6 Color matching functions of the EIZO CRT RGB primaries.

MATLAB script: mdsp_web_col_plot_Eizo_cmf.m
Output preview: fig7.6.png

Fig. 7.7 Cone of physically realizable colors in the CIE 1931 XYZ coordinate system.

MATLAB script: mdsp_web_col_cone_CR_xyz.m
Output preview: fig7.7.png

Fig. 7.8 (a) Illustration of the cone of reproducible colors with red, green and blue display primaries, in the XYZ color coordinate system. (b) The set of reproducible colors with red, green and blue coefficients between 0 and 1,

MATLAB script: mdsp_web_col_analyze_CIE_1931_primaries.m
Output preview: fig7.8a.png; fig7.8b.png

Fig. 7.9 CIE 1924 relative luminous efficiency.

MATLAB script: mdsp_web_col_plot_luminous_efficiency.m
Output preview: fig7.9.png

Fig. 7.10 Maxwell triangle in RGB coordinates.

MATLAB script: mdsp_web_col_maxwell_triangle.m
Output preview: fig7.10.png

Fig. 7.11 Chromaticity diagram for CIE 1931 XYZ primaries.

MATLAB script: mdsp_web_col_plot_xyx_chromaticity.m
Output preview: fig7.11.png

Fig. 7.12 Chromaticities of colors that can be reproduced by addition of positive quantities of typical RGB display primaries.

MATLAB script: mdsp_web_col_sRGB_color_triangle_xy_scaled.m
Output preview: fig7.12.png

Fig. 7.13 Step pattern with linearly increasing tristimulus values and linearly increasing CIELAB coordinates.

MATLAB script: mdsp_web_col_color_step_pattern.m
Output preview: fig7.13a.png ; fig7.13b.png ; fig7.13c.png ; fig7.13d.png;fig7.13e.png ; fig7.13f.png