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Abstract

A method and an apparatus for processing color values in the reproduction of color originals. Color values (R.sub.0, G.sub.0, B.sub.0) of original pixels (P.sub.0) arranged in an original raster network are acquired by pixel-by-pixel and line-by-line, optoelectronic scanning of color originals. For modifying the reproduction scale, an output raster network is generated for output pixels (P.sub.A) to be reproduced, and the color values (R.sub.A, G.sub.A, B.sub.A) of the output pixels (P.sub.A) are respectively calculated from the color values (R.sub.0, G.sub.0, B.sub.0) of the original pixels (P.sub.0) within an interpolation window that is shiftable across the original raster network, being calculated by weighting the color values (R.sub.0, G.sub.0, B.sub.0) with previously calculated weighting coefficients (k.sub.M) and by addition of the weighted color values. A disturbing color offset arises when the color components of the original pixels (P.sub.0) are sequentially scanned in successive scan lines. In this case, a correction of the color offset is advantageously simultaneously implemented with the modification of the reproduction scale, being implemented with the assistance of the weighting coefficients (k.sub.M) identified for the scale modification, whereby no additional calculating time is required for the correction of the color offset. In addition, an image sharpness correction can also be implemented.

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First Claim