--- ray/src/px/pvalue.c	1993/11/09 15:21:00	2.7
+++ ray/src/px/pvalue.c	1994/10/06 13:27:16	2.9
@@ -91,9 +91,8 @@ char  **argv;
 				if (argv[i+1][0] == '-' || argv[i+1][0] == '+')
 					d = pow(2.0, d);
 				if (argv[i][0] == '-')
-					doexposure = 100;
+					expval *= d;
 				scalecolor(exposure, d);
-				expval *= d;
 				doexposure++;
 				i++;
 				break;
@@ -199,10 +198,14 @@ unkopt:
 			setmode(fileno(fin), O_BINARY);
 #endif
 					/* get header */
-		if (header && checkheader(fin, fmtid, stdout) < 0) {
-			fprintf(stderr, "%s: wrong input format\n", progname);
-			quit(1);
-		}
+		if (header) {
+			if (checkheader(fin, fmtid, stdout) < 0) {
+				fprintf(stderr, "%s: wrong input format\n",
+						progname);
+				quit(1);
+			}
+		} else
+			newheader("RADIANCE", stdout);
 					/* get resolution */
 		if ((resolution && !fgetsresolu(&picres, fin)) ||
 				picres.xr <= 0 || picres.yr <= 0) {
@@ -211,7 +214,7 @@ unkopt:
 		}
 						/* add to header */
 		printargs(i, argv, stdout);
-		if (doexposure > 100)
+		if (expval < .99 || expval > 1.01)
 			fputexpos(expval, stdout);
 		fputformat(COLRFMT, stdout);
 		putchar('\n');
@@ -236,7 +239,7 @@ unkopt:
 		}
 		if (header) {
 			printargs(i, argv, stdout);
-			if (doexposure > 100)
+			if (expval < .99 || expval > 1.01)
 				fputexpos(expval, stdout);
 			fputformat(fmtid, stdout);
 			putchar('\n');
@@ -257,10 +260,9 @@ char  *line;
 	double	d;
 	COLOR	ctmp;
 
-	if (isformat(line)) {
-		formatval(fmt, line);
+	if (formatval(fmt, line))
 		wrongformat = strcmp(fmt, COLRFMT);
-	} else if (original && isexpos(line)) {
+	else if (original && isexpos(line)) {
 		d = 1.0/exposval(line);
 		scalecolor(exposure, d);
 		doexposure++;