Method of varying the ink density of the full tone in offset printing within a rotoary printing machine
AssigneeMAN Roland Druckmaschinen AG
InventorArmin Weichmann
Life of this patent
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Abstract
A method of varying the ink density of the full tone in printing within a rotary printing machine with an ink application system which can provide a constant quantity of ink which, in spite of constant ink supply from the inking unit, permits control of the full-tone density or adaptation of the raster tonal values in the print. The method includes setting the binary image on a printing plate. A basic raster of raster points, which determines the area coverage of the binary image, is produced on the printing plate for the variable-area image information. The basic raster is then superimposed on a fine microraster in such way that the area coverage of the basic raster is reduced by a percentage which can be set between 0% and 100%.
Claims19
A method of varying the ink density of a full tone in printing within a rotary printing machine with an ink application system that supplies a constant quantity of ink, said method comprising the steps of:
- setting a binary image on a printing plate, the binary image including a basic raster of raster points for variable-area image information on the printing plate, the raster points determining the area coverage of the basic raster;
- and
- superimposing the basic raster on a fine microraster such that the area coverage of the basic raster on the printing plate is reduced by a desired variation from a full tone of the basic raster corresponding to a percentage within the range including 0% to 100%.
Dependencies are inferred from the claim text.