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Graphics as Input

Graphics as Input

An image is equivalent to its symbolic expression. You can operate on an image as you would on a symbolic expression.
This input produces some disks:
Wolfram Language code: Graphics[Table[{RGBColor[i / 2, .7, j / 2], Disk[{2 i, 2j}]}, {i, 0, 2}, {j, 0, 2}]]
Type // InputForm after the graphic to get the symbolic expression that corresponds to the graphic:
Wolfram Language code: Graphics[Table[{RGBColor[i / 2, .7, j / 2], Disk[{2 i, 2j}]}, {i, 0, 2}, {j, 0, 2}]]
Wolfram Language code: [image]//InputForm
Type a Wolfram Language Replace command after the output graphic and evaluate:
Wolfram Language code: [image] /. Disk -> Rectangle
The disks are now replaced by squares.