| 摘要 |
Image quality is improved when monochrome printing by using an image processing method having a monochrome printing mode and a color printing mode for reproducing a gray image using a plurality of colors in a case where the monochrome printing mode is set. The image processing method includes the steps of inputting gray image data, converting the gray image data into color image data composed of a plurality of color components, performing a quantization process to the color image data, and performing an error diffusion process for distributing a quantization error of the color image data to peripheral pixels of an objective pixel in accordance with a direction set for each of the color components.
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