Invention Grant
US08068257B2 Color printing reducing artifacts and banding by rendering black dots, replacing dots with process black, and adding non-black dots for different subsets of black dots
有权
彩色打印通过渲染黑点减少伪影和条纹,用过程黑色代替点,并为不同的黑点子集添加非黑点
- Patent Title: Color printing reducing artifacts and banding by rendering black dots, replacing dots with process black, and adding non-black dots for different subsets of black dots
- Patent Title (中): 彩色打印通过渲染黑点减少伪影和条纹,用过程黑色代替点,并为不同的黑点子集添加非黑点
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Application No.: US12390583Application Date: 2009-02-23
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Publication No.: US08068257B2Publication Date: 2011-11-29
- Inventor: Xing Li , Francis K. Tse , Zhenhuan Wen , David J. Metcalfe
- Applicant: Xing Li , Francis K. Tse , Zhenhuan Wen , David J. Metcalfe
- Applicant Address: US CT Norwalk
- Assignee: Xerox Corp.
- Current Assignee: Xerox Corp.
- Current Assignee Address: US CT Norwalk
- Agency: Fay Sharpe LLP
- Main IPC: H04N1/52
- IPC: H04N1/52 ; H04N1/58 ; H04N1/034 ; B41J2/205

Abstract:
A method of printing comprising setting a pixel black value of K for an ink limit and identifying each of black dots of a first subset of black dots having pixel black value K greater than the ink limit, and pixel color value of cyan, magenta, and yellow equal to zero. The method further comprises rendering only K for a pixel value for the first subset of black dots and replacing each of black dots of a second subset of black dots of a halftoned bit map for a predetermined area with a process black dot. The method still further comprises adding a non-black dot to each of black dots of a third subset of black dots of the bit-mapped data, wherein the halftoned bit map is generated by halftoning continuous tone data; wherein the black dots of the third subset comprises a percentage of all the black dots that tends to generally increase as a ratio of black coverage to total coverage in the predetermined area increases; wherein the first, second, and third subset comprises black dots that are mutually exclusive; and, printing the bit map.
Public/Granted literature
- US20100214341A1 COLOR PRINTING Public/Granted day:2010-08-26
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