Hell Gravure Systems Gmbh

Ernst Rudolf Gottfried Weidlich

In a method for changing the size of line elements on a printed page, first the nature of the size change is determined and a positive/negative identifier identifying the nature (positive/negative) of the line elements is determined for each pixel of the printed page. A copy window whose expanse determines the desired size change is defined around a substitution field. Copy window and substitution field are displaced across the printed page, and the density values of the copy window are compared to the density value of the substitution field in each window position. Dependent on the nature of the size change, on the positive/negative identifier determined for the substitution field and on the result of the density value comparison, a decision is made in each window position for the substitution field as to whether the density value of the substitution field is replaced by a characteristic density value of the copy window or by a part thereof or not in order to achieve a broadening and/or narrowing of the line elements.

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Kiel, Germany

Ernst Rudolf Gottfried Weidlich