| 摘要 |
The technique of the present invention carries out color conversion of first image data expressed by a first color system into second image data expressed by a second color system. The procedure first collects multiple adjoining pixels of the first image data into one block, and calculates a tone difference of the first image data in the block based on the first image data of the respective pixels. When the calculated tone difference is less than a preset value, procedure carries out collective color conversion without discrimination of the respective pixels included in the block. This enables the high-speed color conversion. When the calculated tone difference is not less than the preset value, on the other hand, the procedure carries out color conversion by a unit of each pixel included in the block. This prevents deterioration of the picture quality. The technique of the invention thus ensures the high-speed color conversion without deteriorating the picture quality.
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