Index: /branches/release-29/lib/MT/Template/ContextHandlers.pm
===================================================================
--- /branches/release-29/lib/MT/Template/ContextHandlers.pm (revision 1333)
+++ /branches/release-29/lib/MT/Template/ContextHandlers.pm (revision 1367)
@@ -7806,5 +7806,8 @@
             $ret = $size;
         }
-    } elsif (($prop =~ m/^image_/) && $class !~ m/Image/) {
+    } elsif ($prop =~ m/^image_/ && $class->can($prop)) {
+        # These are numbers, so default to 0.
+        $ret = $a->$prop || 0;
+    } elsif ($prop =~ m/^image_/) {
         $ret = 0;
     } else {