Index: /trunk/ippTools/src/chiptool.c
===================================================================
--- /trunk/ippTools/src/chiptool.c	(revision 11971)
+++ /trunk/ippTools/src/chiptool.c	(revision 11972)
@@ -817,8 +817,4 @@
         return false;
     }
-    if (isnan(bg)) {
-        psError(PS_ERR_UNKNOWN, true, "-bg is required");
-        return false;
-    }
 
     psF64 bg_stdev = psMetadataLookupF64(&status, config->args, "-bg_stdev");
@@ -827,16 +823,8 @@
         return false;
     }
-    if (isnan(bg_stdev)) {
-        psError(PS_ERR_UNKNOWN, true, "-bg_stdev is required");
-        return false;
-    }
 
     psF64 bg_mean_stdev = psMetadataLookupF64(&status, config->args, "-bg_mean_stdev");
     if (!status) {
         psError(PS_ERR_UNKNOWN, false, "failed to lookup value for -bg_mean_stdev");
-        return false;
-    }
-    if (isnan(bg_mean_stdev)) {
-        psError(PS_ERR_UNKNOWN, true, "-bg_mean_stdev is required");
         return false;
     }