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    • 9. 发明授权
    • Gamut mapping preserving local luminance differences
    • 色域映射保留局部亮度差异
    • US06646762B1
    • 2003-11-11
    • US09435308
    • 1999-11-05
    • Thyagarajan BalasubramanianRicardo L. de QueirozKaren M. BraunReiner Eschbach
    • Thyagarajan BalasubramanianRicardo L. de QueirozKaren M. BraunReiner Eschbach
    • G06F1300
    • H04N1/6058
    • A color printing process, printing a color image in which out-of-gamut original colors are present. For each pixel defined by an original color which is determined to be out of gamut, a gamut remapping process is applied to map each pixel to a color which is within a printer gamut, remapping said pixels to colors within an output printer gamut. For a given set of gamut remapped pixels, gamut remapped pixel colors are compared with said original pixel colors, to derive a comparison metric. Using the comparison metric, a corrected set of gamut remapped colors is generated. The comparison metric may be subjected to an adaptive filtering process, which strengthens the comparison metric in high frequency image regions to increase its impact on the gamut remapped colors, and weakens the comparison metric in low frequency areas, to weaken its impact on the gamut remapped colors.
    • 彩色打印处理,打印出色域原色的彩色图像。 对于被确定为超出色域的原始颜色限定的每个像素,应用色域重新映射处理以将每个像素映射到在打印机色域内的颜色,将所述像素重新映射到输出打印机色域内的颜色。 对于给定的色域重映射像素集合,将色域重新映射的像素颜色与所述原始像素颜色进行比较,以导出比较度量。 使用比较度量,生成校正的色域重映射颜色集合。 比较度量可以进行自适应滤波处理,其加强了高频图像区域中的比较度量,以增加其对色域重映射颜色的影响,并且削弱了低频区域中的比较度量,以削弱其对色域重新映射的影响 颜色。