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Summary:
This paper is a further study of ICC-based digital proofing performance with actual press runs conducted to test the color matching performance between the digital proof and the press sheet. Emphasis in the study has been placed on digital proofer qualification and minimization of press variability. In order to improve color match between digital proof and press sheet, we tested stability and color gamut of the digital proofer. In addition, we used a modified one-ink-zone profiling target and a modified one-ink-zone IT8.7/3 basic target as a means to minimize the influence of press variability. The average DE of the IT8.7/3 basic target between digital proof and press sheet was further reduced to 2.3. This study also provided us with physical samples for visual comparison between digital proofs and press sheets. It was observed that there were noticeable color differences between the ICC-based digital proof and the press sheet which can be summarized by the CRF (Cumulative Relative Frequency) curves for proofs and press sheets.