Index: /trunk/psphot/src/psphot.c
===================================================================
--- /trunk/psphot/src/psphot.c	(revision 10790)
+++ /trunk/psphot/src/psphot.c	(revision 10791)
@@ -2,5 +2,5 @@
 
 static void usage (void) {
-    fprintf (stderr, "USAGE: psphot [-file INPUT.fits] [-list INPUT.txt] OUTPUT\n");
+    fprintf (stderr, "USAGE: psphot [-file image(s)] [-list imagelist] (output)\n");
     exit (2);
 }
@@ -12,7 +12,4 @@
     psphotErrorRegister();              // register our error codes/messages
 
-    // basic pslib options
-    psLogSetFormat ("M");
-
     // load implementation-specific models
     psphotModelGroupInit ();
@@ -20,9 +17,9 @@
     // load command-line arguments, options, and system config data
     pmConfig *config = psphotArguments (argc, argv);
-    if (config == NULL) usage ();
+    if (!config) usage ();
 
     // load input data (config and images (signal, noise, mask)
     if (!psphotParseCamera (config)) {
-        psErrorStackPrint(stderr, " ");
+        psErrorStackPrint(stderr, "error setting up the camera");
         exit(1);
     }