Six-color separation for improving graininess in a middle tone region

Chang-Hwan Son; Yun-Tae Kim; Cheol-Hee Lee; Yeong-Ho Ha

doi:10.1117/12.526261

18 December 2003 Six-color separation for improving graininess in a middle tone region

Chang-Hwan Son, Yun-Tae Kim, Cheol-Hee Lee, Yeong-Ho Ha

Proceedings Volume 5293, Color Imaging IX: Processing, Hardcopy, and Applications; (2003) https://doi.org/10.1117/12.526261
Event: Electronic Imaging 2004, 2004, San Jose, California, United States

Abstract

This paper proposes an improved six-color separation method that reduces the graininess in middle tone regions based on the standard deviation of lightness and chrominance in SCIELAB space. Graininess is regarded as the visual perception of the fluctuation of the lightness of light cyan and cyan or light magenta and magenta. In conventional methods, granularity is extremely heuristic and inaccurate due to the use of a visual examination score. Accordingly, this paper proposes an objective method for calculating granularity for six-color separation. First, the lightness, redness-greenness, and yellowness-blueness of SCIELAB space is calculated, reflecting the spatial-color sensitivity of the human eye and the sum of the three standard deviations normalized. Finally, after assigning the proposed granularity to a lookup table, the objective granularity is applied to six-color separation , thereby reducing the graininess in middle tone regions.

Citation Download Citation

Chang-Hwan Son, Yun-Tae Kim, Cheol-Hee Lee, and Yeong-Ho Ha "Six-color separation for improving graininess in a middle tone region", Proc. SPIE 5293, Color Imaging IX: Processing, Hardcopy, and Applications, (18 December 2003); https://doi.org/10.1117/12.526261

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