how to compare 2 bmp images ?

Hi all . i am creating an application that needs to detect the bmp images changes against a perticuler image specification but i do not how. For example if i have bmp1 and bmp2 and the program makes compare if they are identical it does not thing and if they are diffrent it gives me a massage in masssage box that 2 pics are diffrent . and bmp3 comes it compares it against bmp1 and if they are diffrent it prompt me and do this compare ....

All images are of same size . I be happy if some one show me how that can be done.Thanks

Compare against what..??

Size..? resolution..?? etc...

expand a little..

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Originally Posted by some1uk03

Compare against what..??

Size..? resolution..?? etc...

expand a little..

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I want to keep checking a windows at perticuler location that when i have either one of these icons!! i attached them they are bmp files

as u see they are same size!!