hue difference

When the hue difference increased, the magnitude of color shift in test target decreased, but the deflection angle of color shift vector from constant hue line increased.

当诱导域与试验域之间的色调差增大时，试验目标色觉位移的幅值减小，而色觉位移矢量偏离恒定色调线的偏向角却增大。

Hue difference Yu, the more easy to maintain, but the audience's attention.

色调不同俞不小, 愈便当保持受众的夺纲力, 反之则非.

Conclusion: The mixed color turned to red when the hue difference is over 0.6. When the chroma difference is more than 1.3, the color change of porcelain restoration become perceptible to human eyes.

结论：①背景色彩度差大于0.6时，试件和背景混和色明度减小，色相趋向红色；②当背景色彩度差值大于1.3时，陶瓷修复体色彩的变化达到肉眼可辨别的水平。

Additionally, because dot gain, more than 80 % will not have the same hue difference.

另外, 由于网不面扩不小, 80%以上同一色相不会有太不小差别.