filter()Apply convolution mask filter either to the whole quadrille or at specific (row, col) cell.
filter(mask, [row], [col])
| mask | Quadrille: quadrille of numbers representing the convolution mask |
| row | Number: cell row coordinate, default is 0 which applies filter to the whole quadrille |
| col | Number: cell col coordinate, default is 0 which applies filter to the whole quadrille |