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Separation of the tonal values for reproducing an a*b*-plane and the resulting color prediction of the forward optical printer model for a multi-material 3D printer. Most colors are out of gamut and are gamut mapped. Edges in the tonal value images can result in structural artifacts in the color prediction, visible as whitish lines in the output. This is because similar node-colors of the CLUT are mapped to different tonal values and the multi-linear interpolation results in colors that are not similar to either node-color.

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