In this paper, a kind of new G7 digital printing plate is designed by CorelDraw12 software, and all the experiments are carried out on Founder Yinjie C5100 digital press. Select values of density, dot increase values and CIEL*a*b* values to plot the neutral print density curves and dot increase curves with matlab software. Calibrate the G7 standard parameters in process of quality control. Build ICC profiles and printing color gamut respectively after attaining neutral gray balance. The research shows that G7 technology can improve the printing quality efficiently, and the paper offers a realistically applying for the operation.
By experimental method, the optimum parameters for offset ink were investigated under standard printing conditions. Firstly, the relationship between solid ink density and print contrast was established, and the optimum values of solid ink densities and print contrasts were calculated. Then, perfect tone reproduction was achieved by dot gain compensation, in which the calibration curves were obtained by the target curves and the initial tone value increase(TVI) curves based on optimum SIDs. The results showed that this method of determining the optimum parameters for offset inks were practicable and reliable, it can be used to research the printability of inks and papers, optimize printing process, improve printing quality, and provide method of standardization of process control for printing institutions.
By experimental and comparison method, printing characteristics of light paper were studied. A test form was designed for monitoring reproduction processes and evaluating reproduction characteristics. Then it was output on film, plates, and paper in turns. Results showed that performance of paper has a direct impact on reproduction quality; prints made by light paper have less color saturation, lower print contrast, much dot loss in light areas and less color gamut than those by offset paper. However, the difference between them was very small. Under good control this environmental friendly paper was absolutely able to the high quantitative offset paper in book printing. Effective measurements of improving printing quality on light paper printing were derived
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