$_params
$_params : array
Valid parameters: - width: (integer) The target width.
- height: (integer) The target height.
- ratio: (boolean) Keep aspect ratio.
- delta_x: (integer) How much the seam may move on x axis (A value of 0 causes the seam to be straight).
- rigidity: (integer) Introduces a bias for non-straight seams. Typically zero