--- ray/src/px/mt160r.c	1989/10/20 20:35:59	1.4
+++ ray/src/px/mt160r.c	1991/04/18 14:35:09	1.7
@@ -39,7 +39,6 @@ char  *fname;
 	FILE  *input;
 	int  xres, yres;
 	COLR  scanline[NCOLS];
-	char  sbuf[256];
 	int  i;
 
 	if (fname == NULL) {
@@ -50,8 +49,10 @@ char  *fname;
 		return(-1);
 	}
 				/* discard header */
-	while (fgets(sbuf, sizeof(sbuf), input) != NULL && sbuf[0] != '\n')
-		;
+	if (checkheader(input, COLRFMT, NULL) < 0) {
+		fprintf(stderr, "%s: not a Radiance picture\n", fname);
+		return(-1);
+	}
 				/* get picture dimensions */
 	if (fgetresolu(&xres, &yres, input) != (YMAJOR|YDECR)) {
 		fprintf(stderr, "%s: bad picture size\n", fname);
@@ -69,7 +70,7 @@ char  *fname;
 			fprintf(stderr, "%s: read error (y=%d)\n", fname, i);
 			return(-1);
 		}
-		normcolrs(scanline, xres);
+		normcolrs(scanline, xres, 0);
 		plotscan(scanline, xres, i);
 	}