--- ray/src/util/rmtxop.c	2021/01/19 23:32:00	2.18
+++ ray/src/util/rmtxop.c	2023/11/21 01:30:20	2.21
@@ -1,5 +1,5 @@
 #ifndef lint
-static const char RCSid[] = "$Id: rmtxop.c,v 2.18 2021/01/19 23:32:00 greg Exp $";
+static const char RCSid[] = "$Id: rmtxop.c,v 2.21 2023/11/21 01:30:20 greg Exp $";
 #endif
 /*
  * General component matrix operations.
@@ -38,7 +38,7 @@ int	verbose = 0;			/* verbose reporting? */
 static int
 loadmatrix(ROPMAT *rop)
 {
-	if (rop->mtx != NULL)
+	if (rop->mtx != NULL)		/* already loaded? */
 		return(0);
 
 	rop->mtx = rmx_load(rop->inspec, rop->rmp);
@@ -239,7 +239,7 @@ op_right2left(ROPMAT *mop)
 	while (rpos-- > 0) {
 		if (mright == NULL)
 			break;
-		mright = binaryop(mop[rpos].inspec,
+		mright = binaryop(mop[rpos+1].inspec,
 				loadop(mop+rpos), mop[rpos].binop, mright);
 	}
 	return(mright);
@@ -418,6 +418,8 @@ main(int argc, char *argv[])
 					/* write result to stdout */
 	if (outfmt == DTfromHeader)
 		outfmt = mres->dtype;
+	if ((outfmt == DTrgbe) & (mres->ncomp > 3))
+		outfmt = DTspec;
 	if (outfmt != DTascii)
 		SET_FILE_BINARY(stdout);
 	newheader("RADIANCE", stdout);
@@ -430,7 +432,7 @@ main(int argc, char *argv[])
 	return(0);
 userr:
 	fprintf(stderr,
-	"Usage: %s [-v][-f[adfc][-t][-s sf .. | -c ce ..][-r[fb]] m1 [.+*/] .. > mres\n",
+	"Usage: %s [-v][-f[adfc][-t][-s sf .. | -c ce ..][-rf|-rb] m1 [.+*/] .. > mres\n",
 			argv[0]);
 	return(1);
 }