| 摘要 |
To provide a color printing apparatus which is freed of a problem such that, if gradation conversion processing of picture data is to be implemented by hardware, the number of the registers is prohibitively increased to increase the cost if the gradation curve information required for gradation conversion processing is to be stored in its entirety in the registers. The printing apparatus includes a basic gradation curve register for storage of the basic gradation curve information and a shifting quantity register for storing the shifting quantity information. The values of the information data are calculated by the gradation curve calculation circuit to generate the gradation curve information which is stored in gradation curve information registers. The color picture data entered to the apparatus are gradation-converted, based on the gradation curve information, and are transferred to an engine part in the apparatus to output a picture.
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