| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem of deterioration inherent to an error diffusing method that arises in a low-density area under a high-density area of an image with a relatively simple method. SOLUTION: An image processing method according to the present invention is used for an error diffusion method that binarizes pixels of image data represented by multi-valued gradation values or converts them to a predetermined plurality of values with a predetermined threshold as a criterion, and diffuses an error of a pixel to be processed to other unprocessed pixel. When a comparison is made between density of the pixel to be processed and that of the pixel immediately above it, and the density of the target pixel is lower than that of the pixel immediately above the target one, the density of the target pixel is changed to an average value of the target pixel and immediately above one. When the density of the target pixel is higher than that of the immediately above pixel, the density of the target pixel is used as it is.
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