Dr. Ing. Rudolf Hell Gmbh

Dr.- Ing. Rudolph Hell Gmbh

Jurgen Klie

Klaus Wellendorf

Eberhard Hennig

Rainer Nehl

Method and apparatus for eliminating image defects in polychromatic printing which arise due to lack of registration in the superimposed printing of individual color separations with different colored inks wherein from the four color separation signals M, C, Y and K the color separation signal which defines the contour is determined in the area of the contour. This color separation signal which corresponds to the color of the selected signal is replaced in the lighter or, respectively, darker area by the selected color separation signal and the color separation signals of the darker or, respectively, lighter areas which are adjacent to the lighter or, respectively, darker areas are retained unaltered so that the white streaks and imperfections of the prior art are eliminated.

Method and apparatus for eliminating defects in images in polychromatic

In a method for copying retouch in color picture reproduction, color values are initially acquired by image-point-by-image-point trichromatic color picture scanning and digitization. The color values are deposited in a storage medium and are addressable by image point coordinates. With the coordinate pen of a coordinate acquisition means, the retoucher first marks a read point within a first image region from which a pattern is to be taken and a write point within a second image region into which the pattern is to be copied with image point precision. A distance between the read and write points is determined from the acquired image point coordinates and is fixed. The retoucher then acquires all image point coordinates within the first image region with the assistance of a coordinate pen. The image point coordinates of those image points within the second image region exhibiting the respective fixed distance from the acquired image points are simultaneously identified and a double coordinate pen is thus simulated. For precise pattern transfer, the color values of the first image region addressed with the assistance of the double coordinate pen are replaced image-point-by-image-point by the simultaneously addressed color values of the second image region or by values calculated from the color values.

Method and an apparatus for copying retouch in electronic color picture

A method for smoothing retouch in electronic color image reproduction employs a coordinate pen used by the retoucher as a retouch brush, to identify image point coordinates within an image point area. The color values associated with the image point coordinates are changed as a function of the color values of the nearby image point coordinates. The size of the areas which have their color values changed is operator-selectable. The color values of the areas which are changed can be matched to the marginal values of the area, or may be replaced by a mean value of the color values within the area. By this means image contours may be flattened, and the effective noise in the image surfaces may be minimized.

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Toekendorf, Germany

Jurgen Klie