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    • 6. 发明授权
    • Image processing suitable for changing the number of colors in an image
    • 适合于改变图像中颜色数量的图像处理
    • US5949556A
    • 1999-09-07
    • US321018
    • 1994-10-06
    • Shunichi Tamai
    • Shunichi Tamai
    • G03F3/08H04N1/60
    • H04N1/60
    • An image processing apparatus converts color image data into hue, saturation and luminosity data. When a specific color portion and a range are designated in the hue data, processing for reducing tones is executed based on the designated data. Thereafter, a reverse-conversion into color image data is performed, thereby making it possible to output a high-quality image of an illustration. Further, a histogram of designated hue data is generated, processing for reducing tones is executed based on the histogram, and the data is subsequently reverse-converted into color image data. This makes it possible to output a higher quality image of an illustration.
    • 图像处理装置将彩色图像数据转换为色调,饱和度和亮度数据。 当在色调数据中指定特定颜色部分和范围时,基于所指定的数据执行降低色调的处理。 此后,进行彩色图像数据的反向转换,从而可以输出图示的高质量图像。 此外,生成指定的色调数据的直方图,基于直方图执行减少色调的处理,然后将数据反向转换为彩色图像数据。 这使得可以输出更高质量的图示图像。