Index: trunk/ppSub/src/ppSubReadoutSubtract.c
===================================================================
--- trunk/ppSub/src/ppSubReadoutSubtract.c	(revision 23642)
+++ trunk/ppSub/src/ppSubReadoutSubtract.c	(revision 23740)
@@ -23,9 +23,7 @@
 #define WCS_TOLERANCE 0.001             // Tolerance for WCS
 
-bool ppSubReadoutSubtract(pmConfig *config, const pmFPAview *view)
+bool ppSubReadoutSubtract(pmConfig *config)
 {
     psAssert(config, "Require configuration");
-    psAssert(view, "Require view");
-
 
     // Look up recipe values
@@ -35,4 +33,6 @@
 
     bool reverse = psMetadataLookupBool(&mdok, config->arguments, "REVERSE"); // Reverse sense of subtraction?
+
+    pmFPAview *view = ppSubViewReadout(); // View to readout
 
     // Subtraction is: minuend - subtrahend
@@ -91,4 +91,5 @@
         psError(PS_ERR_UNKNOWN, false, "Unable to copy concepts from input to output.");
         psFree(outRO);
+        psFree(view);
         return false;
     }
@@ -99,4 +100,5 @@
     pmHDU *outHDU = outFPA->hdu;        // Output HDU
     pmChip *outChip = pmFPAfileThisChip(config->files, view, "PPSUB.OUTPUT"); // Output chip
+    psFree(view);
     if (!outHDU || !inHDU) {
         psError(PS_ERR_UNKNOWN, false, "Unable to find HDU at FPA level to copy astrometry.");