Index: includes/image.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/image.inc,v
retrieving revision 1.40
diff -u -r1.40 image.inc
--- includes/image.inc	16 Jul 2010 02:39:38 -0000	1.40
+++ includes/image.inc	6 Dec 2010 04:51:49 -0000
@@ -122,7 +122,7 @@
  */
 function image_get_info($filepath, $toolkit = FALSE) {
   $details = FALSE;
-  if (!is_file($filepath)) {
+  if (!is_file($filepath) && !is_uploaded_file($filepath)) {
     return $details;
   }