Invention Grant
- Patent Title: Printing apparatus, printing data generation apparatus and method therefor, and printing data generation program
- Patent Title (中): 打印装置，打印数据生成装置及其方法以及打印数据生成程序
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Application No.: US14631417Application Date: 2015-02-25
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Publication No.: US09363415B2Publication Date: 2016-06-07
- Inventor: Satoshi Yamazaki
- Applicant: SEIKO EPSON CORPORATION
- Applicant Address: JP Tokyo
- Assignee: Seiko Epson Corporation
- Current Assignee: Seiko Epson Corporation
- Current Assignee Address: JP Tokyo
- Agency: Global IP Counselors, LLP
- Priority: JP2014-041097 20140304
- Main IPC: H04N1/40
- IPC: H04N1/40 ; H04N1/405 ; G06K15/02 ; H04N1/52 ; G06K15/00
Abstract:
A printing apparatus includes an input unit; a halftone processing unit; and a print unit. The halftone processing unit includes a comparison unit comparing one of a plurality of threshold values and a data gradation value, and an error diffusion unit generating dot data by comparing the data gradation value with an error diffusion threshold value. In a case where the data gradation value is less than the threshold value, the error diffusion threshold value is set to a high threshold value greater than a low threshold value. The high threshold value is set to a maximum value of the data gradation value or higher where the data gradation value is a predetermined value or higher, and to a value lower than the maximum value in a predetermined gradation range not less than the predetermined value.
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