| 摘要 |
<p>A method and a device for producing separation images which are essentially orthogonally screened for reproducing an original colour image. In one embodiment, the original image is mounted on a drum (1) which is rotated in a Y-direction. A sensor is moved in an X-direction, essentially orthogonal to the Y-directionaxially of the drum (1) adjacent the drum's surface and senses the several colours of the original image (12) on a point by point basis. The distances in theX and Y-directions (1<Sub>2</Sub>, 1,) between the scanned points on the original image (12) are changed for each separation image according to trigomometric relationships.</p><p>Thus, separation images are produced which have equal screen ruling and different screen angles relative to a Y-direction. The method and apparatus produce signals which are applied to some form of device or devices which actually generate the separations for use in multicolour printing or the like.</p> |
