https://stackoverflow.com/questions/30659745/how-to-get-full-gallery-image-url-path-using-magento

<code>$categories = Mage::helper('catalog/category')->getStoreCategories();

foreach($categories as $category) {

$categoryId = $category->getId();
$product_collection = Mage::getModel('catalog/category')->load($categoryId)->getProductCollection();

  foreach($product_collection as $product) {

      $product_id = $product->getId();
      $full_product = Mage::getModel('catalog/product')->load($product_id);
      $product_sku = $full_product->getSku();
      $product_name = $full_product->getName();
      $product_url = $full_product->getProductUrl();
      $product_image_url = $full_product->getImageUrl();
      $product_image_url_gallery = $full_product->getMediaGalleryImages();
      echo "Product SKU:".$product_sku; echo "<br/>";
      echo "product name:".$product_name; echo "<br/>";
      echo "product image url:".$product_image_url; echo "<br/>";


      foreach ($product_image_url_gallery as $image) {
        echo Mage::helper('catalog/image')->init($full_product, 'image', $image->getFile()).'<br>';
      }     

      echo "-------------------------------------------------------"; echo "<br/>";

   }
} </code>