16 January 2006 Black extraction method using gamut boundary descriptors
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Color data conversion between CMYK and CIEL*a*b* color space is not directly corresponded, that is many CMYK combinations could reproduce the same CIEL*a*b* value. When building a LUT converting from CIEL*a*b* to CMYK for a CMYK color printer, one to one correspondence between CMYK and CIEL*a*b* must be aimed. The proposed method in this paper follows steps: (1) print and measure CIEL*a*b* values of CMYK reference chart, (2) set-up parameters to assign the amount of black extraction, (3) generate gamut boundary descriptors for gamut mapping and for black extraction using CMYK-CIEL*a*b* data under predetermined black extraction parameters, (4) perform gamut mapping for given CIEL*a*b* using the gamut boundary descriptor for gamut mapping, (5) determine K value of the gamut-mapped CIEL*a*b* using the gamut boundary descriptors for black extraction. The suggested method determines K value for given CIEL*a*b* using gamut boundary descriptors in CIEL*a*b color space. As a result, a color printer using this method can make out accurate black amount and reproduces more consistent CMYK images under different black extraction options.
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Min-Ki Cho, Min-Ki Cho, Byoung-Ho Kang, Byoung-Ho Kang, Heui-Keun Choh, Heui-Keun Choh, } "Black extraction method using gamut boundary descriptors", Proc. SPIE 6058, Color Imaging XI: Processing, Hardcopy, and Applications, 60580O (16 January 2006); doi: 10.1117/12.640907; https://doi.org/10.1117/12.640907


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