Index: imageapi.module
===================================================================
--- imageapi.module	(revision 53)
+++ imageapi.module	(working copy)
@@ -161,7 +161,7 @@
 function imageapi_toolkit_invoke($method, &$image, array $params = array()) {
   $function = $image->toolkit . '_image_' . $method;
   if (function_exists($function)) {
-    array_unshift($params, $image);
+    array_unshift($params, &$image);
     return call_user_func_array($function, $params);
   }
   watchdog('imageapi', 'The selected image handling toolkit %toolkit can not correctly process %function.', array('%toolkit' => $image->toolkit, '%function' => $function), WATCHDOG_ERROR);