Abstract: This paper proposes an implementation of tetrahedral interpolation based on a direct addressing structure of look-up tables for fast device dependent/independent color transformation. The CRT and ink jet printer models were used for exemplification and the procedure was used for colorimetric calibration, but the method is generally applicable for any color device. The models are based on look-up tables and tetrahedral interpolation of LUT values. The direct transformation avoids completely the searching procedure for the tetrahedron that includes the interpolated color. For the reverse transformation, the searching procedure is applied to a reduced set of tetrahedrons and is optimized based on the use of the direct addressing tables structure. The time performance of algorithm depends on the number of calibration colors, direct/inverse transformation. The volume of outside gamut colors to be mapped influences also the performance of transformations. The color gamuts of a CRT and of an ink jet printer are represented and compared in Lab and Luv color coordinates in order to select the optimum space to perform the mapping of the outside gamut colors. !11
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