Example

function filter($image_path)
{
    $imagick = new \Imagick(realpath($image_path));
    $matrix = [
        [-1, 0, -1],
        [0,  5,  0],
        [-1, 0, -1],
    ];
    
    $kernel = \ImagickKernel::fromMatrix($matrix);
    $strength = 0.5;
    $kernel->scale($strength, \Imagick::NORMALIZE_KERNEL_VALUE);
    $kernel->addUnityKernel(1 - $strength);

    $imagick->filter($kernel);
    header("Content-Type: image/jpeg");
    echo $imagick->getImageBlob();
}