You must use a same-domain image.
Convolution
Name
Matrix
JS
Identity
0
0
0
0
1
0
0
0
0
Box Blur
1/9
1/9
1/9
1/9
1/9
1/9
1/9
1/9
1/9
Guassian Blur
1/16
1/8
1/16
1/8
1/4
1/8
1/16
1/8
1/16
Laplacian
0
1
0
1
-4
1
0
1
0