Index: trunk/ippScripts/scripts/detrend_reject_imfile.pl
===================================================================
--- trunk/ippScripts/scripts/detrend_reject_imfile.pl	(revision 10700)
+++ trunk/ippScripts/scripts/detrend_reject_imfile.pl	(revision 10719)
@@ -162,7 +162,7 @@
     }
     if ($reject_imfile_sn) {
-	if ($mean / $stdev < $reject_imfile_sn) {
-	    print "Rejecting exposure based on bad imfile S/N for imfile $i: " .
-		$mean / $stdev . " vs " . $reject_imfile_sn . "\n";
+	if ($mean < $stdev * $reject_imfile_sn) {
+	    print "Rejecting exposure based on bad imfile S/N for imfile $i: \n";
+	    print "mean: " . $mean . " vs " . "stdev*SNlimit: " . $stdev * $reject_imfile_sn . "\n";
 	    $reject = 1;
 	    last;
@@ -193,6 +193,6 @@
 if ($reject_exp_mean) {
     if (abs($mean) > $reject_exp_mean * $stdev) {
-	print "Rejecting exposure based on bad mean: " . ($mean / $stdev) . " vs " .
-	    $reject_exp_mean . "\n";
+	print "Rejecting exposure based on bad mean: \n";
+	print "mean: $mean, stdev: $stdev (limit is: % $reject_exp_mean\n";
 	$reject = 1;
     } 
@@ -222,7 +222,7 @@
 # reject if the signal-to-noise is insufficient
 if ($reject_exp_sn) {
-    if ($mean / $stdev < $reject_exp_sn) {
-	print "Rejecting exposure based on poor S/N: " . $mean / $stdev . " vs " . 
-	    $reject_exp_sn . "\n";
+    if ($mean < $stdev * $reject_exp_sn) {
+	print "Rejecting exposure based on poor S/N: \n";
+	print "signal: $mean vs noise: $stdev (s/n limit is: $reject_exp_sn)\n";
 	$reject = 1;
     }
@@ -306,2 +306,4 @@
 ## the same logical cuts above can be applied to components in an
 ## imfile, imfiles in an exposure, and exposures in a stack
+
+### this function needs to avoid div by zero: compare Signal vs Noise*limit