This work presents an interactive tool for 3-dim visualization of color gamuts and calculation of their volume in CIELab space. In a first step, a color generator module simulates the colors obtained from a given set of dyes CMYK (RGB) in an idealized printing process. The dyes are characterized by their spectral densities as measured in solution. Color mixing is applied according to Lambert Beer law, i.e. linear combinations of the spectral densities are calculated. These represent "inner spectra" of the receiving layer and the non-linear Saunderson model is applied to take the optical effect of the air/receiver interface into account, finally leading to "external spectra". By making complete abstraction from a halftone structure, the potential gamut volume of a given set of CMYK (RGB) inks can be benchmarked without influence or limitation by the underlying printing process or the receiving layer. A recently introduced, fast and robust 3-dim surface reconstruction method (Tight Cocone) is then used to obtain a closed surface triangulation, from which the volume of the gamut is obtained with standard methods of vector analysis. Some applications of the tool are shown in comparison with other methods.
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