--- ray/src/px/glimage.c	1990/01/26 08:18:38	1.2
+++ ray/src/px/glimage.c	1991/11/13 11:08:36	2.1
@@ -16,7 +16,9 @@ static char SCCSid[] = "$SunId$ LBL";
 
 #include  "color.h"
 
+#include  "resolu.h"
 
+
 main(argc, argv)				/* print a picture */
 int  argc;
 char  *argv[];
@@ -39,9 +41,12 @@ char  *argv[];
 		exit(1);
 	}
 				/* discard header */
-	getheader(input, NULL);
+	if (checkheader(input, COLRFMT, NULL) < 0) {
+		fprintf(stderr, "%s: not a Radiance picture\n", fname);
+		exit(1);
+	}
 				/* get picture dimensions */
-	if (fgetresolu(&xres, &yres, input) != (YMAJOR|YDECR)) {
+	if (fgetresolu(&xres, &yres, input) < 0) {
 		fprintf(stderr, "%s: bad picture size\n", fname);
 		exit(1);
 	}