Need fast Bitmap Compare Method

I am hoping someone couldpresent a prebuilt class or code that shows how to 
compare 2 bitmaps and returnonly the changed area's. The one I currently built 
is just too slow. Slow as init will actually scan image 2 and compare it to 
Image 1 in like 2 seconds.veryvery slow.







My solution is in C#, whichis what my app is in. C++ would be faster, just as 
long as I can dllimport itin and the return be compatible.







Any suggestions would beappreciated.







Steve




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