--- ray/src/util/radcompare.c	2019/08/15 17:28:45	2.21
+++ ray/src/util/radcompare.c	2020/06/30 22:53:05	2.24
@@ -1,5 +1,5 @@
 #ifndef lint
-static const char RCSid[] = "$Id: radcompare.c,v 2.21 2019/08/15 17:28:45 greg Exp $";
+static const char RCSid[] = "$Id: radcompare.c,v 2.24 2020/06/30 22:53:05 greg Exp $";
 #endif
 /*
  * Compare Radiance files for significant differences
@@ -224,12 +224,12 @@ color_check(COLOR c1, COLOR c2)
 static int
 norm_check(FVECT nv1, FVECT nv2)
 {
-	double	max2 = nv1[2]*nv1[2];
+	double	max2 = nv1[2]*nv2[2];
 	int	imax = 2;
 	int	i = 2;
 					/* identify largest component */
 	while (i--) {
-		double	tm2 = nv1[i]*nv1[i];
+		double	tm2 = nv1[i]*nv2[i];
 		if (tm2 > max2) {
 			imax = i;
 			max2 = tm2;
@@ -317,6 +317,7 @@ equiv_string(char *s1, char *s2)
 static int
 setheadvar(char *val, void *p)
 {
+	char	newval[128];
 	LUTAB	*htp = (LUTAB *)p;
 	LUENT	*tep;
 	char	*key;
@@ -359,8 +360,13 @@ setheadvar(char *val, void *p)
 		return(-1);	/* memory allocation error */
 	if (!tep->key)
 		tep->key = strcpy(malloc(kln+1), key);
-	if (tep->data)
+	if (tep->data) {	/* check for special cases */
+		if (!strcmp(key, "EXPOSURE")) {
+			sprintf(newval, "%f", atof(tep->data)*atof(val));
+			vln = strlen(val = newval);
+		}
 		free(tep->data);
+	}
 	tep->data = strcpy(malloc(vln+1), val);
 	return(1);
 }
@@ -696,7 +702,7 @@ set_refdepth(DEPTHCODEC *dcp, LUTAB *htp)
 	static char	depthvar[] = DEPTHSTR;
 	const char	*drval;
 
-	depthvar[LDEPTHSTR] = '\0';
+	depthvar[LDEPTHSTR-1] = '\0';
 	drval = (const char *)lu_find(htp, depthvar)->data;
 	if (!drval)
 		return(0);