--- ray/src/px/pcomb.c	1993/04/29 14:32:07	2.10
+++ ray/src/px/pcomb.c	1993/06/14 15:59:46	2.13
@@ -21,8 +21,8 @@ static char SCCSid[] = "$SunId$ LBL";
 #include "view.h"
 
 #define MAXINP		32		/* maximum number of input files */
-#define WINSIZ		9		/* scanline window size */
-#define MIDSCN		4		/* current scan position */
+#define WINSIZ		17		/* scanline window size */
+#define MIDSCN		((WINSIZ-1)/2+1)
 
 struct {
 	char	*name;		/* file or command name */
@@ -484,9 +484,9 @@ register char	*nam;
 		lorg[fn][0] = lorg[fn][1] = lorg[fn][2] = 0.0;
 		ldir[fn][0] = ldir[fn][1] = ldir[fn][2] = 0.0;
 		if (input[fn].vw.type == 0)
-			errno = ERANGE;
+			errno = EDOM;
 		else {
-			pix2loc(loc, &input[fn].rs, xpos, ypos);
+			pix2loc(loc, &input[fn].rs, xscan, ymax-1-yscan);
 			if (viewray(lorg[fn], ldir[fn],
 					&input[fn].vw, loc[0], loc[1]) < 0)
 				errno = ERANGE;