]> 2026-04-04T09:55:35+02:00 Publications:A New method for colour measurements in graphic arts 500 en <p>This article presents a method for colour measurements directly on printed half-tone multicoloured pictures. The article introduces the concept of colour impression. By this concept we mean the CMY or CMYK vector (colour vector), which lives in the three- or four-dimensional space of printing inks. Two factors contribute to values of the vector components, namely, the percentage of the area covered by cyan, magenta, yellow, and black inks (tonal values) and ink densities. The colour vector expresses integrated information about the tonal values and ink densities. Values of the colour vector components increase if tonal values or ink densities rise and vice versa. If, for some primary colour, the ink density and tonal value do not change, the corresponding component of the colour vector remains constant. If some reference values of the colour vector components are set from a preprint, then, after an appropriate calibration, the colour vector directly shows how much the operator needs to raise or lower the cyan, magenta, yellow, and black ink densities in order to correct colours of the picture being measured. The values of the components are obtained by registering the RGB image from the measuring area and then transforming the set of registered RGB values to the triplet or quadruple of CMY or CMYK values, respectively. Algorithms based on artificial neural networks are used for performing the transformation. During the experimental investigations, we have found a good correlation between components of the colour vector and ink densities.</p> http://dx.doi.org/10.1002/(SICI)1520-6378(199906)24:3<185::AID-COL5>3.0.CO;2-1 http://hh.diva-portal.org/smash/record.jsf?searchId=1&pid=diva2:285839 196 3 Color Research and Application Journal Paper 185 A New method for colour measurements in graphic arts 24 1999 2016-09-30T20:40:14Z 2457662.3612731 A New method for colour measurements in graphic arts 500 0 plainlist list 1 [[:Publications:A New method for colour measurements in graphic arts]] A New method for colour measurements in graphic arts# QUERY6fd2f46bd0c983091cff8b37b059049d 500 [2,"smw-datavalue-property-restricted-annotation-use","Publisher"] A New method for colour measurements in graphic arts# ERR6c155b5d70b69ddb590b4f2e73389c2a 500 [2,"smw-datavalue-property-restricted-annotation-use","Author"] A New method for colour measurements in graphic arts# ERRe24f17e090c98448f3de99d03182b7b6