Colour quality control in Kaerkimedia newspapers

摘要

Nowadays newspapers receive advertisement material in digital form. In many countries there are special companies that sell media space for a group of newspapers. Newspapers receive the same digital advertisement material and the customer expects the printed result to be as similar as possible in different newspapers. Newspapers are trying to reach this goal by applying the ISO 12647-3 standard. A system developed for Finnish newspapers to control and benchmark the quality is presented in this paper. Grey balance and special test targets are printed with the advertisements and measured data is send to the central database for reporting. The results show that dot gain is the most deviating parameter from the ISO 12647-3 standard. Especially the dot gain for the newspapers that are applying CTP is lower than the standard. Based on the measurements the tolerances for fall-tone densities are defined in this paper. How the grey balance and fall-tone densities correlate is also analysed.