chromatic sum equation

例句：

1. 1.The painting is chromatic in color.
   这幅画色彩斑斓。
2. 2. The chromatic spectrum is the visible range of colors.
   色域是可见光的颜色范围。
3. 3. The chromatic balance is important for good taste.
   色彩平衡对于良好的品味很重要。