盒阴影的结构和text - shadow相同，x轴偏移，y轴偏移，模糊，颜色。
The structure for box shadow is same as the text-shadow property: x-offset, y-offset, blur, and color.
法线贴图使用颜色来表述在其他方向的偏移，这使它更有效。
Normal mapping on the other hand uses colors to indicate directional offsets, making it far more efficient.
同样，由于残留的同步信号而导致的黑电平上很小的直流偏移依然能够影响颜色的平衡和各个视频通道的增益。
Again, small DCshifts in the black level caused by residual sync can disturb the colorbalance or gains of the video channels.
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