| 摘要 |
When a multi-level image having a first resolution is converted into a multi-level image having a second resolution lower than the first resolution, attribute data including a conversion processed flag indicating a kind of conversion and a conversion result is generated and held associated with pixel data of a pixel on interest undergone the conversion corresponding to an attribute flag indicating an attribute in which a pixel before the conversion is located. When the multi-level image having the first resolution is restored from the multi-level image having the second resolution, the pixel data of the pixel of interest is replaced with pixel data of a plurality of pixels in correspondence with the conversion processed flag in the attribute data held associated with the pixel data of the pixel on interest and pixel data of pixels around the pixel of interest.
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