Index: trunk/ippScripts/scripts/diff_skycell.pl
===================================================================
--- trunk/ippScripts/scripts/diff_skycell.pl	(revision 32665)
+++ trunk/ippScripts/scripts/diff_skycell.pl	(revision 35133)
@@ -299,4 +299,9 @@
 my $jpeg1Name = prepare_output("PPSUB.OUTPUT.JPEG1", $outroot, 1);
 my $jpeg2Name = prepare_output("PPSUB.OUTPUT.JPEG2", $outroot, 1);
+
+# do we always need to prepare this file?
+if ($reduction ne 'NOCONVDIFF') {
+    my $refConv = prepare_output("PPSUB.REF.CONV", $outroot, 1);
+}
 
 my ($inverseName, $inverseMask, $inverseVariance, $inverseSources);