Index: trunk/Ohana/src/opihi/cmd.data/center.c
===================================================================
--- trunk/Ohana/src/opihi/cmd.data/center.c	(revision 29540)
+++ trunk/Ohana/src/opihi/cmd.data/center.c	(revision 37807)
@@ -16,4 +16,11 @@
   if (!GetImage (NULL, &kapa, name)) return (FALSE);
   FREE (name);
+
+  int channel = 0;
+  if ((N = get_argument (argc, argv, "-ch"))) {
+    channel = GetKapaChannelFromString (argv[N]);
+    if (!channel) return FALSE;
+    KiiSetChannel (kapa, channel - 1);
+  }
 
   // XXX need an option to center the image based on the current plot limits