| 摘要 |
A method for converting N-bit image data of a digital image into M-bit image data, in which N-M=K, K>0, is disclosed. The method is adapted to be used for dithering in an image processing system or a computer graphic system. For example, an N-bit red color value of each pixel of the digital image can be converted into an M-bit red color value by this method with little or no color deviation. According to the method, a difference of the most significant n bits and the least significant n bits of the N-bit image data of a pixel is used as a preliminary criterion for color value conversion, in which n is preferably equal to K. An apparatus for converting N-bit image data of a digital image into M-bit image data, in which N-M=K, K>0, is also disclosed. The apparatus includes a subtraction operator for realizing the difference of the most significant n bits and the least significant n bits of the N-bit image data of the pixel.
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