--- modules/system/image.gd.inc	2010-05-28 11:51:04.000000000 -0500
+++ modules/system/image_copy.gd.inc	2010-05-28 11:52:37.000000000 -0500
@@ -336,7 +336,7 @@ function image_gd_create_tmp(stdClass $i
  */
 function image_gd_get_info(stdClass $image) {
   $details = FALSE;
-  $data = getimagesize($image->source);
+  $data = getimagesize(drupal_realpath($image->source);
 
   if (isset($data) && is_array($data)) {
     $extensions = array('1' => 'gif', '2' => 'jpg', '3' => 'png');