Index: trunk/ppStack/src/ppStackMatch.c
===================================================================
--- trunk/ppStack/src/ppStackMatch.c	(revision 24215)
+++ trunk/ppStack/src/ppStackMatch.c	(revision 24846)
@@ -512,17 +512,20 @@
         psBinaryOp(readout->variance, readout->variance, "*", psScalarAlloc(PS_SQR(norm), PS_TYPE_F32));
     }
-
+   
     // Ensure the background value is zero
     psStats *bg = psStatsAlloc(PS_STAT_ROBUST_MEDIAN | PS_STAT_ROBUST_STDEV); // Statistics for background
     psRandom *rng = psRandomAlloc(PS_RANDOM_TAUS); // Random number generator
     if (!psImageBackground(bg, NULL, readout->image, readout->mask, maskVal | maskBad, rng)) {
-        psWarning("Can't measure background for image.");
-        psErrorClear();
+      psWarning("Can't measure background for image.");
+      psErrorClear();
     } else {
-        psLogMsg("ppStack", PS_LOG_INFO, "Correcting convolved image background by %lf (+/- %lf)",
-                 psStatsGetValue(bg, PS_STAT_ROBUST_MEDIAN), psStatsGetValue(bg, PS_STAT_ROBUST_STDEV));
-        (void)psBinaryOp(readout->image, readout->image, "-",
-                         psScalarAlloc(psStatsGetValue(bg, PS_STAT_ROBUST_MEDIAN), PS_TYPE_F32));
-    }
+      if (!psMetadataLookupBool(NULL, config->arguments, "PPSTACK.SKIP.BG.SUB")) {
+	psLogMsg("ppStack", PS_LOG_INFO, "Correcting convolved image background by %lf (+/- %lf)",
+		 psStatsGetValue(bg, PS_STAT_ROBUST_MEDIAN), psStatsGetValue(bg, PS_STAT_ROBUST_STDEV));
+	(void)psBinaryOp(readout->image, readout->image, "-",
+			 psScalarAlloc(psStatsGetValue(bg, PS_STAT_ROBUST_MEDIAN), PS_TYPE_F32));
+      }
+    }
+    
 
     // Measure the variance level for the weighting