Translator Disclaimer
18 December 2003 Six-color separation for improving graininess in a middle tone region
Author Affiliations +
Proceedings Volume 5293, Color Imaging IX: Processing, Hardcopy, and Applications; (2003)
Event: Electronic Imaging 2004, 2004, San Jose, California, United States
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.
© (2003) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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);


Memory-color test forms in real-world applications
Proceedings of SPIE (December 18 2003)
Hardcopy global color correction
Proceedings of SPIE (January 16 2006)
Evaluating the smoothness of color transformations
Proceedings of SPIE (January 25 2011)

Back to Top