Index: trunk/ppSub/src/ppSubCamera.c
===================================================================
--- trunk/ppSub/src/ppSubCamera.c	(revision 17834)
+++ trunk/ppSub/src/ppSubCamera.c	(revision 18289)
@@ -82,5 +82,5 @@
 
     // Output image
-    pmFPAfile *output = pmFPAfileDefineSkycell(config, NULL, "PPSUB.OUTPUT");
+    pmFPAfile *output = pmFPAfileDefineFromFile(config, input, 1, 1, "PPSUB.OUTPUT");
     if (!output) {
         psError(PS_ERR_IO, false, _("Unable to generate output file from PPSUB.OUTPUT"));
@@ -94,5 +94,5 @@
 
     // Output mask
-    pmFPAfile *outMask = pmFPAfileDefineSkycell(config, output->fpa, "PPSUB.OUTPUT.MASK");
+    pmFPAfile *outMask = pmFPAfileDefineOutput(config, output->fpa, "PPSUB.OUTPUT.MASK");
     if (!outMask) {
         psError(PS_ERR_IO, false, _("Unable to generate output file from PPSUB.OUTPUT.MASK"));
@@ -107,5 +107,5 @@
     // Output weight
     if (inputWeight && refWeight) {
-        pmFPAfile *outWeight = pmFPAfileDefineSkycell(config, output->fpa, "PPSUB.OUTPUT.WEIGHT");
+        pmFPAfile *outWeight = pmFPAfileDefineOutput(config, output->fpa, "PPSUB.OUTPUT.WEIGHT");
         if (!outWeight) {
             psError(PS_ERR_IO, false, _("Unable to generate output file from PPSUB.OUTPUT.WEIGHT"));
@@ -119,8 +119,10 @@
     }
 
+#if 0
     if (!pmFPAAddSourceFromFormat(output->fpa, "Subtraction", output->format)) {
         psError(PS_ERR_UNKNOWN, false, "Unable to generate output FPA.");
         return false;
     }
+#endif
 
     pmFPAfile *sources = pmFPAfileDefineFromArgs(&status, config, "PPSUB.SOURCES", "PPSUB.SOURCES");
@@ -153,5 +155,5 @@
 
         // Internal-ish file for getting the PSF from the matched addition
-        pmFPAfile *psf = pmFPAfileDefineSkycell(config, psphot->fpa, "PSPHOT.PSF.LOAD");
+        pmFPAfile *psf = pmFPAfileDefineOutputFromFile(config, output, "PSPHOT.PSF.LOAD");
         if (!psf) {
             psError(PS_ERR_IO, false, "Failed to build FPA from PSPHOT.PSF.LOAD");