| 摘要 |
An image data processing apparatus separately applies prescribed gradation treatment to character and picture pattern areas of an input image signal in accordance with an image separation signal using a dither pattern and outputs a prescribed image signal to a write section. Such an image data processing apparatus includes a dither pattern storage device for storing at least one dither pattern. An address decoding device is also included so as to decode a prescribed address of the dither pattern storage device from the input image signal and similar signals. Further, a character/picture pattern switch position changing device is included so as to change a character/picture pattern switch position in an image area separation signal using a prescribed signal output from a pixel clock counter so that the switching position from a character portion is delayed, and a picture pattern/character selecting device is included so as to select one of character and picture pattern area in accordance with the changed image area separation signal and outputs the prescribed image signal to the write section.
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