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That link below is dead - this one is better - https://en.wikipedia.org/wiki/Kernel_(image_processing)
I think this is very user full to understand that problem http://www.roborealm.com/help/Convolution.php https://docs.gimp.org/en/plug-in-convmatrix.html
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That link below is dead - this one is better - https://en.wikipedia.org/wiki/Kernel_(image_processing)
I think this is very user full to understand that problem http://www.roborealm.com/help/Convolution.php https://docs.gimp.org/en/plug-in-convmatrix.html