Index: trunk/psLib/src/imageops/psImageBackground.c
===================================================================
--- trunk/psLib/src/imageops/psImageBackground.c	(revision 17371)
+++ trunk/psLib/src/imageops/psImageBackground.c	(revision 17640)
@@ -74,6 +74,7 @@
     }
     if (n < 0.01*Nsubset) {
-        psLogMsg ("psLib", PS_LOG_INFO, "too few data points");
-        psFree (values);
+        psLogMsg("psLib.psImageBackground", PS_LOG_INFO,
+                 "Unable to measure image background: too few data points (%d)", n);
+        psFree(values);
         return false;
     }