Index: trunk/ppStack/src/ppStackCamera.c
===================================================================
--- trunk/ppStack/src/ppStackCamera.c	(revision 14626)
+++ trunk/ppStack/src/ppStackCamera.c	(revision 14811)
@@ -214,4 +214,16 @@
     }
 
+    // Sources for use as stamps
+    bool status = false;                // Found the file?
+    pmFPAfile *sources = pmFPAfileDefineFromArgs(&status, config, "PPSTACK.SOURCES", "PPSTACK.SOURCES");
+    if (!status) {
+        psError(PS_ERR_IO, false, "Failed to load file definition PPSTACK.SOURCES");
+        return false;
+    }
+    if (sources && sources->type != PM_FPA_FILE_CMF) {
+        psError(PS_ERR_IO, true, "PPSTACK.SOURCES is not of type CMF");
+        return false;
+    }
+
     // 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