公开(公告)号：US20030048478A1

公开(公告)日：2003-03-13

申请号：US09947838

申请日：2001-09-05

Applicant: Xerox Corporation

Inventor： Shirley Cheng ,  Mark A. Gwaltney ,  Robert P. Loce ,  Martin S. Maltz ,  Connie F. Purdum

IPC: H04N001/405 ,  G06K015/00 ,  G03F003/08

CPC classification number: H04N1/4078

Abstract: Method, system and computer-readable medium containing instructions for performing halftone gamma correction in a printing environment to achieve and maintain high print quality. The system includes one or more subsystems, including a tone reproduction subsystem that creates one or more print calibration pages, each having a tone curve defining a relationship between a plurality of input color levels, output color levels and a level of measured darkness. A pixel adjustment subsystem associates each input color level with one of the output color levels based on a desired percentage change in the level of measured darkness. Further, a gamma correction system performs gamma correction on a selected tone curve of one of the print calibration pages by associating each input color level with one of the output color levels based on the desired percentage change in the level of measured darkness in a substantially flat region of the selected tone curve.

Abstract translation: 包含用于在打印环境中执行半色调伽马校正的指令以实现和保持高打印质量的方法，系统和计算机可读介质。 该系统包括一个或多个子系统，包括创建一个或多个打印校准页面的色调再现子系统，每个打印校准页面具有定义多个输入颜色级别，输出颜色级别和测量黑暗级别之间的关系的色调曲线。 像素调整子系统基于所测量的黑暗级别的期望百分比变化将每个输入颜色级别与输出颜色级别之一相关联。 此外，伽马校正系统通过将每个输入颜色级别与输出颜色级别之一相关联，基于在基本平坦的测量黑暗级别中的期望百分比变化，对所选择的打印校准页面之一的色调曲线进行伽马校正 所选色调曲线的区域。