Modify Featured Image Size in Info Window Message on Google Maps

gistfile1.txt

add_filter('wpgmp_featured_image_size', 'wpgmp_featured_image_size',1,3 );

function wpgmp_featured_image_size($size,$post,$map) {
	
  	//$size = 'thumbnail';
  	//$size = 'medium';
  	
  	$size = array(50,50); 
  	
	return $size;
}