# How does kernel work in unsharp masking?

I applied the kernel below to the picture for unsharp masking

k = [-1 -1 -1; -1 8 -1; -1 -1 -1]


I got !

Then I changed 8 to 14. And I got How does kernel work for unsharp masking the original picture and what does exactly do the number in the middle ?

$$\left[ \begin{array}{ccc} -1 &&-1 &&-1 \\ -1 && 8 && -1 \\ -1 &&-1 &&-1 \end{array} \right]$$