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    • 6. 发明授权
    • Method and system for reproducing color images as duotones
    • 将彩色图像再现为双色调的方法和系统
    • US5982924A
    • 1999-11-09
    • US904945
    • 1997-08-01
    • Joanna L. PowerBrad S. WestEric J. StollnitzDavid H. Salesin
    • Joanna L. PowerBrad S. WestEric J. StollnitzDavid H. Salesin
    • B32B5/26B41M3/00H04N1/56H04N1/60G06K9/00
    • H04N1/56B32B5/26B41M3/008H04N1/6016H04N1/6058H04N1/6097Y10T442/197Y10T442/66Y10T442/668
    • A full color process image that can be printed with cyan, magenta, yellow, and black inks is produced as a duotone image using only two colors of ink. Color data defining the colors used in the full color image serve as input to a process that maps the colors into a duotone gamut defined by the two colors of ink that will be used to produce the duotone image. A user is able to select 0, 1, or 2 colors of ink for the duotone image, and the software program automatically chooses the remaining ink or inks so as to reproduce the image as accurately as possible; the software also produces the appropriate color separations automatically. In addition, the paper color can be specified by the user or optimally determined by the optimizing process of the software to optimize the duotone image reproducing a full color image that has little white. The paper color provides a free third color. A black separation can also optionally be included when printing the duotone image to expand the range of luminance available. When black ink is used, some amount of black is subtracted from the each color of the original image before the optimization and mapping process is applied, and the black separation is determined to add back the appropriate amount of black when printing the duotone image. The duotone images produced by the method are relatively high-quality, economical alternatives to full-color printing.
    • 可以使用青色,品红色,黄色和黑色墨水打印的全色过程图像仅使用两种颜色的油墨作为双色图像。 定义全色图像中使用的颜色的颜色数据用作将颜色映射到由用于产生双色图像的两种颜色的墨水定义的双色域的过程的输入。 用户能够为双色调图像选择0,1或2种颜色的墨水,并且软件程序自动选择剩余的墨水或墨水,以便尽可能准确地再现图像; 该软件还自动生成适当的分色。 此外,纸张颜色可以由用户指定或通过软件的优化处理最佳地确定,以优化双色调图像,再现具有小白色的全色图像。 纸张颜色提供免费的第三种颜色。 当打印双色图像以扩大可用亮度的范围时,也可以包括黑色分离。 当使用黑色墨水时,在应用优化和映射处理之前,从原始图像的每种颜色中减去一定量的黑色,并且确定黑色分离以在打印双色图像时添加适当量的黑色。 通过该方法生产的双色调图像是全彩色打印相对高质量,经济的替代品。