Index: trunk/ppStack/src/ppStackCamera.c
===================================================================
--- trunk/ppStack/src/ppStackCamera.c	(revision 14280)
+++ trunk/ppStack/src/ppStackCamera.c	(revision 14404)
@@ -223,4 +223,21 @@
     }
 
+    // For photometry, we operate on the chip-mosaicked image
+    // we create a copy of the mosaicked image for psphot so we can write out a clean image
+    bool mdok = false;
+    bool doPhotom = psMetadataLookupBool(&mdok, config->arguments, "PHOTOM"); // perform photometry
+    if (doPhotom) {
+        // this file is just used as a carrier; output files (eg, PSPHOT.RESID) are defined by
+        // psphotDefineFiles
+        pmFPAfile *psphotInput = pmFPAfileDefineFromFPA (config, output->fpa, 1, 1, "PSPHOT.INPUT");
+        PS_ASSERT (psphotInput, false);
+
+        // define associated psphot input/output files
+        if (!psphotDefineFiles (config, psphotInput)) {
+            psError(PSPHOT_ERR_CONFIG, false, "Trouble defining the additional input/output files for psphot");
+            return false;
+        }
+    }
+
     return true;
 }