private function radialBlur(array $params) {
        $this->checkRequiredParams($params, ['angle']);

        $angle = (float) $params['angle'];

        try {
            $this->imagick->radialBlurImage($angle);
        } catch (ImagickException $e) {
            throw new TransformationException($e->getMessage(), 400, $e);
        }

        $this->image->hasBeenTransformed(true);
    }