Index: trunk/ppSub/src/ppSubLoop.c
===================================================================
--- trunk/ppSub/src/ppSubLoop.c	(revision 29003)
+++ trunk/ppSub/src/ppSubLoop.c	(revision 29937)
@@ -57,4 +57,30 @@
     }
 
+    if (data->forcedPhot1) {
+	bool foundDetections = false;
+	if (!ppSubInputDetections(&foundDetections, "PPSUB.POS1.SOURCES", "PPSUB.INPUT", data)) {
+	    psError(psErrorCodeLast(), false, "Unable to measure positive detections (1)");
+	    return false;
+	}
+	// if nothing was found, don't bother doing the forced photometry below
+	if (!foundDetections) {
+	    psWarning ("no sources found in positive image 1, skipping forced photometry");
+	    data->forcedPhot1 = false;
+	}
+    }
+    if (data->forcedPhot2) {
+	bool foundDetections = false;
+	if (!ppSubInputDetections(&foundDetections, "PPSUB.POS2.SOURCES", "PPSUB.REF", data)) {
+	    psError(psErrorCodeLast(), false, "Unable to measure positive detections (2)");
+	    return false;
+	}
+	// if nothing was found, don't bother doing the forced photometry below
+	if (!foundDetections) {
+	    psWarning ("no sources found in positive image 1, skipping forced photometry");
+	    data->forcedPhot1 = false;
+	}
+    }
+
+    // XXX if it exists, use the POS1, POS2 results for the FWHMs
     if (!ppSubMatchPSFs(data)) {
         psError(psErrorCodeLast(), false, "Unable to match PSFs.");
@@ -70,4 +96,7 @@
         return false;
     }
+
+    // XXX add in a positive image detection step here (if needed)
+    
 
     psMetadataAddF32(data->stats, PS_LIST_TAIL, "TIME_MATCH", 0, "Time to match PSFs",
@@ -153,4 +182,20 @@
     }
     // dumpout(config, "diff.3.fits");
+
+    // forced photometry for positive image 1
+    if (data->forcedPhot1 && !data->quality) {
+	if (!ppSubReadoutForcedPhot("PPSUB.FORCED1.SOURCES", "PPSUB.OUTPUT", "PPSUB.POS1.SOURCES", data)) {
+	    psError(psErrorCodeLast(), false, "Unable to perform photometry.");
+	    return false;
+	}
+    }
+
+    // forced photometry for positive image 2
+    if (data->forcedPhot2 && !data->quality) {
+	if (!ppSubReadoutForcedPhot("PPSUB.FORCED2.SOURCES", "PPSUB.OUTPUT", "PPSUB.POS2.SOURCES", data)) {
+	    psError(psErrorCodeLast(), false, "Unable to perform photometry.");
+	    return false;
+	}
+    }
 
     if (!ppSubFilesIterateUp(config, PPSUB_FILES_PHOT_SUB)) {
@@ -227,4 +272,8 @@
     }
 
+    pmFPAfileDropInternal(config->files, "PSPHOT.BACKGND");
+    pmFPAfileDropInternal(config->files, "PSPHOT.BACKMDL");
+    pmFPAfileDropInternal(config->files, "PSPHOT.BACKMDL.STDEV");
+
     return true;
 }