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Compare the difference between the 2 pictures and circle the difference

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I found a lot of questions about comparing the difference between 2 images so I came up with the idea to compare and circle the difference but didn't know where to start. Looking for help and direction

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Just load the 2 pictures with GDI+.  Use _GDIPlus_BitmapLockBits (see example) on the 2 pictures then compare integer (32 bits) by integer.  If pictures are of different sizes, then resize them with _GDIPlus_ImageResize beforehand...

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