高保真多色分色模型中间色的设置

高保真印刷技术通过在CMYK的基础上增加其他原色的方法,达到扩大色域的目的,增加的原色与CMYK之间存在替代关系,替代关系可以简化复杂的高保真多色分色模型,并提高其精度。以CMYKRBG七色高保真模型中R为例,设计了渐变测控条,打印输出并测量了各级网点密度,采用多项式回归算法,拟合出了间色平衡曲线,建立了R与MY的替代方程,通过设置间色替代率,获取了R与MY之间的颜色替代量,最后设置了4组不同的间色替代率,通过色差确定了合适的间色替代率的取值范围。实验结果表明:确定的间色替代率在0.2左右,可以提高分色模型的精度。

A Mid-color Setting Method for Hi-Fi Color Separation Model

By adding some original colors to CMYK,Hi-Fi printing technology can expand the gamut.The original colors added have substitution relation with CMYK.The substitution relation can simplify the complex Hi-Fi color separation model and improve precision.The R in CMYKRGB 7 colors Hi-Fi model was taken as an example,and gradient-type control trip was designed and printed.The density was measured.The mid-color balance curve was fitted by polynomial regression algorithm to build the alternative equation.The substitution between R and MY was obtained by setting the mid-color replacement rate.4 groups of different mid-color replacement rate were set and ΔE was measured to determine the proper range of the mid-color replacement rate.The results showed that the accuracy of the separation model is improved by setting the mid-color replacement rate as 0.2.