| 摘要 |
In a known printer that may create different types of dots having different densities or different ink quantities, there is a problem that the types of dots to be created in the respective pixels included in an image are not determined by taking into account the restriction of ink duty. A printer of the present invention has a head that provides two inks of different densities, that is, a higher-density ink and a lower-density ink, with respect to at least one hue, and may create dots of different ink quantities. The technique of the present invention provides a table that stores expected quantities of inks to be spouted for respective color components of image data corresponding to tone values regarding the respective color components of the image data. The technique refers to the table and sets an expected quantity of ink to be spouted for each color component in each pixel based on input image data, in order to keep the restriction of ink duty. The technique then carries out a multi-valuing process for each color component and determines creation or non-creation of the respective types of dots having different ink quantities, so as to make the quantity of ink actually spouted in each pixel closed to the expected quantity of ink. This arrangement enables the different types of dots having different densities or different ink quantities to be created appropriately, while keeping the restriction of ink duty.
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