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Swapping image areas

 
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Say I have a square with width (# of rows) 300 and height (# of columns) 300. Say I have two square images both with area 100. If picture 1 starts at row 10 and column 10 and picture 2 starts at row 10 and column 200, how do I swap their areas, essentially swapping their locations? I have tried the following code

It moves my image in the right direction but sort of smears across the image. How can I swap these two image areas so I can change their locations?
 
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