Index: trunk/psphot/src/psphotParseCamera.c
===================================================================
--- trunk/psphot/src/psphotParseCamera.c	(revision 21458)
+++ trunk/psphot/src/psphotParseCamera.c	(revision 26894)
@@ -39,4 +39,6 @@
         return NULL;
     }
+    // specify the number of psphot input images
+    psMetadataAddS32 (config->arguments, PS_LIST_TAIL, "PSPHOT.INPUT.NUM", PS_META_REPLACE, "number of inputs", 1);
 
     // define the additional input/output files associated with psphot