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Summary:
Colour control in digital printing is an area not yet as well penetrated as colour control and colour management for conventional printing in offset. This paper presents results from a study concerning different aspects of colour rendering in digital printing. The study was carried out in co-operation between Framkom and representatives from Swedish media and paper institutions and industry. About 40 different paper qualities have been tested for aspects of print quality. The paper focuses on the results obtained from the study with respect to the influence of paper quality, press parameters and screening technology on the colour rendering and an attempt has been made to quantify these effects. Attempts to control the colour in the different print trials have been made with the help of colour management and these results are reported in terms of measured colour and perceptually obtained quality. These results will be discussed according to technology and front-end solutions of the digital press, paper quality and estimated effect of the screening technology used. The results showed that offset print quality on coated paper is still ahead of what is possible in digital print technology today. Slightly discernible to more accentuated differences between prints from the different presses were registered both for measured colour data and perceived colour. Differences existbetween offset and digital print technology and there is a difference between those and the way they depend of paper quality. Increased size of colour gamut does not always mean increased print quality. Certain colours are more difficult to reproduce and differences depend on print technology. Paper roughness influences the colour gamut, and dot gain has a strong impact on colour rendering.