Applies a convolution matrix on the image, using the given coefficient and offset.
A GdImage object, returned by one of the image creation functions, such as imagecreatetruecolor.
A 3x3 matrix: an array of three arrays of three floats.
The divisor of the result of the convolution, used for normalization.
Returns true on success or false on failure.
|8.0.0||image expects a GdImage instance now; previously, a resource was expected.|