| 摘要 |
A gray balance correction technique eliminates artifacts, caused by the accumulation of diffusion errors, from a predominantly "gray" tonal area of a halftone image. According to the technique, pixel tonal values associated with three input colors are initially examined to detect a condition that specifies production of a gray image area. Upon detecting this condition, errors from previously processed pixels are averaged prior to being "diffused" among these input color pixels. Thereafter, the input pixels are processed in accordance with conventional halftoning operations and the resulting binary pixel values are passed to an output buffer for printing. Averaging of the errors prior to error diffusion ensures that the detected condition is maintained throughout preprocessing of those input color pixel values.
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