--- ray/src/px/pfilt.c	2004/03/28 20:33:14	2.29
+++ ray/src/px/pfilt.c	2018/07/26 23:50:40	2.32
@@ -1,5 +1,5 @@
 #ifndef lint
-static const char RCSid[] = "$Id: pfilt.c,v 2.29 2004/03/28 20:33:14 schorsch Exp $";
+static const char RCSid[] = "$Id: pfilt.c,v 2.32 2018/07/26 23:50:40 greg Exp $";
 #endif
 /*
  *  pfilt.c - program to post-process picture file.
@@ -85,8 +85,8 @@ int  orad = 0;			/* output window radius */
 char  *progname;
 
 static gethfunc headline;
-static double rgb_bright(COLOR  clr);
-static double xyz_bright(COLOR  clr);
+static brightfunc_t rgb_bright;
+static brightfunc_t xyz_bright;
 static void copyfile(FILE  *in, FILE  *out);
 static void pass1(FILE  *in);
 static void pass2(FILE  *in);
@@ -340,9 +340,8 @@ xyz_bright(
 }
 
 
-double	(*ourbright)() = rgb_bright;
+brightfunc_t *ourbright = rgb_bright;
 
-
 static int
 headline(				/* process line from header */
 	char	*s,
@@ -372,11 +371,11 @@ headline(				/* process line from header */
 
 static void
 copyfile(			/* copy a file */
-	register FILE  *in,
-	register FILE  *out
+	FILE  *in,
+	FILE  *out
 )
 {
-	register int  c;
+	int  c;
 
 	while ((c = getc(in)) != EOF)
 		putc(c, out);
@@ -481,7 +480,7 @@ scan2init(void)			/* prepare scanline arrays */
 {
 	COLOR	ctmp;
 	double	d;
-	register int  i;
+	int  i;
 
 	xbrad = xres/ncols/2 + 1;
 	ybrad = yres/nrows/2 + 1;
@@ -562,7 +561,7 @@ scan2sync(			/* synchronize grey averages and output s
 	static int  nextrow = 0;
 	COLOR  ctmp;
 	int  ybot;
-	register int  c;
+	int  c;
 					/* average input scanlines */
 	while (nextrow <= r+orad && nextrow < nrows) {
 		ybot = (nextrow+.5)*yres/nrows;
@@ -585,7 +584,7 @@ scan2sync(			/* synchronize grey averages and output s
 static void
 scan2flush(void)			/* flush output buffer */
 {
-	register int  r;
+	int  r;
 
 	for (r = nrows-orad; r < nrows; r++)
 		if (fwritescan(scoutbar[r%obarsize], ncols, stdout) < 0)