色度键合成
色度键合成或色度键控是从单张或一系列图像消除背景（通常为绿色）的常用技巧. 背景通常被透明像素替换，然后将图像和其他任意背景进行合成.
| In[1]:= |  X |
| In[2]:= |  X |
| Out[2]= |  |
RemoveBackground 将图像的绿色像素用完全透明的像素替换.
| In[3]:= |  X |
| In[4]:= |  X |
| Out[4]= |  |
将前景合成在少许模糊的背景上来获取散焦效果.
| In[5]:= |  X |
| In[6]:= |  X |
| Out[6]= |  |
将色度键应用于合成视频的所有画面.
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