Method and apparatus for changing the picture point resolution o

Details Method and apparatus for changing the picture point resolution o Method and apparatus for changing the picture point resolution o

1977-10-17

1978-11-28

Murray, Richard

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 78, H04N 146

Patent

active

041278704

ABSTRACT:
Apparatus and method for changing the picture point resolution of color separations of continuous tone pictures in multicolor printing processes during transition from the scanning to reproduction in which the original picture is scanned and color separations are obtained from such scanning in the form of electronically stored digital recorded signals of particular raster points of a fine raster and are then converted into a printing raster wherein a raster system is used for printing which has different compression and extension of the distances of the printed raster points in the scan direction and in the direction at right angles to the scan direction, wherein the distances of the raster points in scan direction and the distances of the raster points at right angles to the scan direction have a ratio of integer numbers and wherein the fine raster is selected such that its raster line interval comprises a multiple of a common divisor of the length resulting from the projection of the printing raster on a line in scan direction or on a perpendicular line relative to the scan direction.

REFERENCES:
patent: 3878559 (1975-04-01), Pugsley
patent: 3944726 (1976-03-01), Ito
patent: 3956583 (1976-05-01), Pugsley

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