Index: trunk/ppStack/src/ppStackLoop.c
===================================================================
--- trunk/ppStack/src/ppStackLoop.c	(revision 20467)
+++ trunk/ppStack/src/ppStackLoop.c	(revision 20494)
@@ -1022,4 +1022,21 @@
     }
 
+    if (psMetadataLookupBool(&mdok, recipe, "RENORM")) {
+        // Statistics for renormalisation
+        psStatsOptions renormMean = psStatsOptionFromString(psMetadataLookupStr(&mdok, recipe,
+                                                                                "RENORM.MEAN"));
+        psStatsOptions renormStdev = psStatsOptionFromString(psMetadataLookupStr(&mdok, recipe,
+                                                                                 "RENORM.STDEV"));
+        int renormNum = psMetadataLookupS32(&mdok, recipe, "RENORM.NUM"); // Number of samples
+        float renormWidth = psMetadataLookupS32(&mdok, recipe, "RENORM.WIDTH"); // Width of Gaussian phot
+        psMaskType maskValue = pmConfigMaskGet("BLANK", config); // Bits to mask
+        if (!pmReadoutWeightRenormPhot(outRO, maskValue, renormNum, renormWidth,
+                                       renormMean, renormStdev, NULL)) {
+            psError(PS_ERR_UNKNOWN, false, "Unable to renormalise variances.");
+            psFree(outRO);
+            return false;
+        }
+    }
+
     if (psMetadataLookupBool(&mdok, recipe, "PHOTOMETRY")) {
         psTrace("ppStack", 1, "Photometering stacked image....\n");