画像の背景を取り替える
画像の背景を検出し，それを完全に透過的な画素に置き換える．
| In[1]:= |  X |
| In[2]:= |  X |
| Out[2]= |  |
異なる背景の上に前景を置く．
| In[3]:= |  X |
| Out[3]= |  |
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