软打样可接受色差的研究

Research on the Acceptable Color Tolerance of Soft Proofing

随着显示技术的发展,屏幕软打样将是今后应用的发展方向之一,这项技术不仅取决于设备,还取决于设备的色彩管理程度。本文通过实验对比硬拷贝打样和屏幕软打样的效果,用客观评价和主观评价两种方法对软打样效果进行检验,确定软打样可接受的色差阈值。实验结果显示,采用高档的显示器,并对显示器进行严格的色彩管理,可以达到印刷打样的目标,显示和硬拷贝间的平均色差可以达到△E*ab=3.5,符合印刷对色差的要求。较大色差主要由超出显示色域的颜色造成,主要分布在高彩度青绿色区域,大部分颜色的显示效果可以满足印刷的一般要求。文章还对主观评价的色差等级与各色差公式的相关性进行了讨论。

Soft proofing is a new technology in recent years. It depends not only on the display and also on the color management. The effect of soft proofing is evaluated through the experiments both by direct color measurement and subjective evaluation. The experiment results show that LCD can be used for printing soft proofing as long as it is color managed. The color differences between display and hardcopy are practical low, the mean AE＊abValue is 3.5. Most large differences are Caused by out-of-gamut colors while most color differences are small enough for printing industry. The relationship between measured color difference and that of subjective evaluated is also discussed in the paper.