LadyXaga

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We used our spectral database as a learning set, and fitted the colour transformation matrix. The real RGB colours (in standard sRGB colour-space) were calculated from the CIE xy coordinates by the published colour matrix (the CIE xy coordinates are obtained in the standard CIE procedure from the spectra). Subsequently, we used the camera RGB colour response to calculate the corresponding dsu colour values. We normalized the colours to � ¯ R + � ¯ G + � ¯ B = 1 . We used this training set to fit the colour transformation matrix from the dsu based colours to the sRGB colour space. The 3 × 3 colour correction matrix provides the transformation from the camera � ¯ RGB values to corrected colours: R = 1.38 � ¯ R + 0.02 � ¯ G + 0.18 � ¯ B (1) G = − 0.32 � ¯ R + 1.40 � ¯ G − 0.19 � ¯ B (2) B = − 0.06 � ¯ R − 0.42 � ¯ G + 1.37 � ¯ B (3) Please note that this transformation is not a unique one, it depends on the learning set of different spectra. However, the final colours do not change significantly when the learning set is modified. We use this transformation throughout this paper.