Applies a custom convolution kernel to the image.
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Image
Bias
Kernel
Applies a custom convolution kernel to the image.
Parameters
kernelarrayThe convolution kernel
channelintProvide any channel constant that is valid for your channel mode. To apply to more than one channel, combine channeltype constants using bitwise operators. Refer to this list of channel constants.
function convolveImage($imagePath, $bias, $kernelMatrix)
{
    $imagick = new \Imagick(realpath($imagePath));
    //$edgeFindingKernel = [-1, -1, -1, -1, 8, -1, -1, -1, -1,];
    $imagick->setImageBias($bias * \Imagick::getQuantum());
    $imagick->convolveImage($kernelMatrix);
    header("Content-Type: image/jpg");
    echo $imagick->getImageBlob();
}