protected function _createImgPreview($inputFile = null) {
		$result = [];
		if (empty($inputFile) || !file_exists($inputFile)) {
			return $result;
		}

		$previewFullPath = $this->_getPreviewDir();
		$wwwRoot = Configure::read('App.www_root');
		if (empty($wwwRoot)) {
			throw new InternalErrorException(__d('view_extension', 'Invalid path to "www_root" directory'));
		}

		$wwwRootPos = mb_stripos($previewFullPath, $wwwRoot);
		if ($wwwRootPos !== 0) {
			throw new InternalErrorException(__d('view_extension', 'Path to preview directory is not contain path to "www_root" directory'));
		}

		$previewWebRootPath = mb_substr($previewFullPath, mb_strlen($wwwRoot) - 1);
		if (empty($previewWebRootPath)) {
			throw new InternalErrorException(__d('view_extension', 'Invalid path to preview directory'));
		}

		$jpgTempFile = uniqid();
		$im = new Imagick();
		$im->setResolution(150, 150);
		if (!$im->readimage($inputFile)) {
			$im->clear();
			$im->destroy();

			return $result;
		}

		$numPages = $im->getNumberImages();
		for ($page = 0; $page < $numPages; $page++) {
			$postfix = '[' . $page . ']';
			$previewFile = $jpgTempFile . $postfix . '.jpg';
			if (!$im->readimage($inputFile . $postfix)) {
				continue;
			}

			$im->setImageFormat('jpeg');
			$im->setImageCompressionQuality(90);
			if ($im->writeImage($previewFullPath . $previewFile)) {
				$result[] = $previewWebRootPath . $previewFile;
			}
		}

		$im->clear();
		$im->destroy();
		if (!empty($result) && (DIRECTORY_SEPARATOR === '\\')) {
			foreach ($result as &$resultItem) {
				$resultItem = mb_ereg_replace('\\\\', '/', $resultItem);
			}
		}

		return $result;
	}