Color-to-colorant transformation for a seven ink process

Harold Boll

doi:10.1117/12.173839

Abstract

Adding RGB inks to the traditional set of CMYK inks increases the attainable color gamut. But the added complexity poses a challenge in generating suitable separations for rendering of color images. The approach taken in this study reduces the dimensionality of the problem by subdividing the 7 inks into smaller groupings. A series of 4 ink subsets from the 7 ink superset of CMYKRGB were individually characterized and a colorimetric transform from ink to color was obtained for each subset. In color space the 4 ink subsets represent adjacent and overlapping subgamuts of the 7 ink gamut. By utilizing these characterizations both individually and in combination with one another, an inktable which transforms color to ink was generated. In the darker tonal region, 4 inks/color permits access to regions of the full 7 ink gamut which are inaccessible to schemes employing 3 inks/color.

Citation Download Citation

Harold Boll, Harold Boll, } "Color-to-colorant transformation for a seven ink process", Proc. SPIE 2170, Device-Independent Color Imaging, (15 April 1994); doi: 10.1117/12.173839; https://doi.org/10.1117/12.173839

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