convolution

Apply convolution of 3x3, 5x5, 7x7 or horizontal/vertical up to 49 elements.

The filter accepts the following options:

0m

1m

2m

3m

Set matrix for each plane. Matrix is sequence of 9, 25 or 49 signed integers in square mode, and from 1 to 49 odd number of signed integers in row mode.

0rdiv

1rdiv

2rdiv

3rdiv

Set multiplier for calculated value for each plane. If unset or 0, it will be 1/sum of all matrix elements.

0bias

1bias

2bias

3bias

Set bias for each plane. This value is added to the result of the multiplication. Useful for making the overall image brighter or darker. Default is 0.0.

0mode

1mode

2mode

3mode

Set matrix mode for each plane. Can be square, row or column. Default is square.