| 摘要 |
In a digital printing process employing a CTP device 14 , hues can easily be changed in a process of generating printing plates without going back to a prior process. A plurality of gradation conversion curves whose gradation characteristics are different stepwise from each other, which are stored in a gradation conversion curve saving unit 22 , are displayed on a display unit 36 . The user selects a desired of the displayed gradation conversion curves with respect to at least one color element with a keyboard/mouse 34 . The selected gradation conversion curve is set in an LUT converter 26 . Input image data G can easily be converted into output image data Ga by converting the gradations of the input image data G according to the gradation conversion curve set in the LUT converter 26 . The image data Ga is converted by a binarizing unit 30 into binary image data H, which is supplied to the CTP device 14 . The CTP device 14 outputs printing plates each bearing a binary image represented by the binary image data H.
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