| 摘要 |
The image processing method converts an input image having multiple tones into an image having fewer tones than the input image, for image recording by a recording head including a plurality of recording elements arranged in a prescribed direction. The pixel values of pixels of the input image are quantized in a processing direction which is set to a direction substantially parallel to a relative conveyance direction of a recording medium with respect to the recording elements when recording onto the recording medium is performed by means of the recording elements. The pixel value for a pixel under processing is quantized according to the result of a comparison between the pixel value for the pixel under processing and a threshold value for the pixel under processing. An error with respect to the pixel under processing caused by quantizing the pixel value for the pixel under processing is diffused into an unprocessed pixel in a periphery of the pixel under processing. A threshold value for the unprocessed pixel of the input image is determined in accordance with the diffused error.
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