| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of converting a digital color image to a digital gray value image. SOLUTION: This method is to distinguishably reproduce different colors in a color image even in a gray value image, the digital color image being built up of a set of pixels each having a color value and the digital gray value image being built of a set of pixels each having a gray value, wherein the color values of the pixels are converted to gray values by the use of a dynamically adapted conversion function which is optimized on the basis of a comparison of color differences in the digital color image and gray value differences corresponding to the color differences in the digital gray value image. In this way, the colors which in conventional conversion methods are imaged on identical or substantially identical gray values can nevertheless be distinguishably reproduced. COPYRIGHT: (C)2003,JPO
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