public function getImageData($pathToImage)
{
$imagick = new \Imagick();
$imagick->setResolution($this->resolution, $this->resolution);
$imagick->readImage(sprintf('%s[%s]', $this->pdfFile, $this->page - 1));
$imagick->mergeImageLayers(\Imagick::LAYERMETHOD_FLATTEN);
$imagick->setFormat($this->determineOutputFormat($pathToImage));
return $imagick;
}