印刷品最小色差与最佳密度的匹配关系研究

Study on the Matching Relationship between Minimum Color Difference and Best Solid Density

在印刷过程中主要通过调整上墨量来控制印刷品的色差,色差大小以CIE 1976Lab色差公式计算ΔE确定,但上墨量的控制参数取决于实地密度。本研究采用四种印刷原色油墨,通过印刷适性仪改变墨层厚度来调整实地密度,通过实验数据分析实地密度D与色度L*a*b*值之间的关系,确定最小色差下的最佳实地密度值,并通过建立数学模型明确了生产操作中墨量增加或者减少的趋势。结果表明,印刷密度与色差之间存在着一定的关联,通过判断墨量变化趋势及最佳密度值,可以获得最小的印刷色差,降低印刷企业成本,提高生产效率。

The control of ink supply can reduce the color difference,and the color difference is determined by the calculation ofΔE by CIE 1976Lab color difference formula.But the control parameter of the ink supply depends on solid density.In this study,four kinds of inks were selected to adjust the solid density by changing the thickness of ink layer through the IGT printability tester.The relationship between solid density D and L*a*b*value of color was analyzed and the best solid density value was determined with minimum color difference.Finally,the mathematical model was established to determine the trend of ink quantity increasing or decreasing in the production operation.The results showed that there is a certain correlation between solid density and the color value.By judging the changing trend of ink volume and the optimal density value,the minimum printing chromatic aberration can be obtained,which reduces the cost of printing enterprises and improves the production efficiency.