Troque o fundo da imagem
Detecte o fundo em uma imagem e o troque por pixels totalmente transparentes.
| In[1]:= |  X |
| In[2]:= |  X |
| Out[2]= |  |
Componha o primeiro plano sobre um fundo diferente.
| In[3]:= |  X |
| Out[3]= |  |
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