To improve the positioning precision of a color layer by retrieving a pixel from a contone (continuous tone) picture stored in a pictured buffer and composing this to one pixel value to generate a warping pixel so as to correct distortion at the beam scanning orbit of an output scanner.
The picture buffer 52 stores all the tags corresponding to some scanning lines of the contone picture together with the scanning line. An interpolation coefficient generator 54 generates an interpolation coefficient identifying a pixel in contone picture data 40 to be used for generating each warping pixel in a warping picture. The ideal pixel grid of a desirable orbit indicates where each pixel in the contone picture 40 is to be moved in order to be a desirable beam scanning orbit. At the time of stepping along the beam scanning orbit of ROS at regular intervals at a pixel position, the outputting position of each warping pixel concerning the ideal pixel is identified.
BANTON MARTIN E
HARRINGTON STEVEN J
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