| 摘要 |
In accordance with inputted half-tone data, the table of recording rates with dark ink is referred to first and it is determined by a systematic dithering method whether dark dots are formed or not. If it is determined that dark dots are formed, a pieozoelectric element (PE) of the head of the ink is driven to form dark dots and a result value (RV) is calculated. On the other hand, if it is determined that dark dots are not formed, the result value RV is 0. In accordance with the inputted half-tone data, it is judged by a method of error diffusion whether dots are formed with low darkness ink or not. Further, the result value is calculated. As a result, the darkness error between a formed image and the original image is decreased to a minimum by the ON/OFF of light dots. Therefore, when a printer which prints by using dots whose darkness per unit area is different is used, the ON/OFF of the different types of dots are adequately determined and the quality of the printing can be improved. Further, a constitution wherein the presence/absence of dots of achromatic color ink influences the formation of dots of cyan ink may be employed.
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