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Graphics As Input

An image is equivalent to its symbolic expression. You can operate on an image as you would a symbolic expression.
This input produces some disks.
In[1]:=
Click for copyable input
Out[1]=
Type // InputForm after the graphic to get the symbolic expression that corresponds to the graphic.
In[2]:=
Click for copyable input
In[3]:=
Click for copyable input
Out[3]//InputForm=
Type a Mathematica Replace command after the output graphic and evaluate.
In[4]:=
Click for copyable input
The disks are now replaced by squares.
Out[5]=
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