Index: trunk/ippScripts/scripts/diff_skycell.pl
===================================================================
--- trunk/ippScripts/scripts/diff_skycell.pl	(revision 23396)
+++ trunk/ippScripts/scripts/diff_skycell.pl	(revision 23397)
@@ -198,5 +198,5 @@
 # Perform subtraction
 unless ($no_op) {
-    my $command = "$ppSub $input $template $outroot";
+    my $command = "$ppSub -inimage $input -refimage $template $outroot";
     $command .= " -inmask $inputMask";
     $command .= " -refmask $templateMask";