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    • 31. 发明授权
    • Color data conversion method, color data conversion apparatus, storage medium, device driver and color conversion table
    • 彩色数据转换方法,彩色数据转换装置,存储介质,设备驱动程序和颜色转换表
    • US07167277B2
    • 2007-01-23
    • US10602642
    • 2003-06-25
    • Masayoshi ShimizuMasahiro MoriShoji SuzukiSatoshi Semba
    • Masayoshi ShimizuMasahiro MoriShoji SuzukiSatoshi Semba
    • G06F15/00G03F3/08G06K9/00
    • H04N1/6058
    • When an L*a*b* value of a certain color is outside a target color gamut to be converted, it is judged whether the L*a*b* value is located within the range of the color gamut set under a predetermined condition. This set range is a range in which the accuracy is degraded if colors are converted using only a first method, for example, a range in the neighborhood of the color gamut. If a color to be converted is located within the range, colors are converted using a second method. If the L*a*b* value of the color to be converted is outside of the set range, it is converted using the first method until the conversion result is contained within the range Then, the occurrence of both a problem which the first conversion method has for colors in the neighborhood of the color gamut when colors are converted and a problem which the second method has in the conversion of a color far from the color gamut can be suppressed.
    • 当特定颜色的L * a * b *值在要转换的目标色域之外时,判断L * a * b *值是否位于在预定条件下设定的色域的范围内。 该设定范围是如果仅使用第一种方法(例如,色域附近的范围)转换颜色,则精度降低的范围。 如果要转换的颜色位于该范围内,则使用第二种方法转换颜色。 如果要转换的颜色的L * a * b *值超出设定范围,则使用第一种方法转换,直到转换结果包含在该范围内。然后,出现第一次转换的问题 可以抑制颜色转换时的色域附近的颜色,并且可以抑制第二种方法在颜色远离色域的转换中的问题。