--- ray/src/util/cmatrix.c	2016/08/18 00:52:48	2.17
+++ ray/src/util/cmatrix.c	2018/04/10 22:11:30	2.19
@@ -1,5 +1,5 @@
 #ifndef lint
-static const char RCSid[] = "$Id: cmatrix.c,v 2.17 2016/08/18 00:52:48 greg Exp $";
+static const char RCSid[] = "$Id: cmatrix.c,v 2.19 2018/04/10 22:11:30 greg Exp $";
 #endif
 /*
  * Color matrix routines.
@@ -21,7 +21,7 @@ const char	*cm_fmt_id[] = {
 		};
 
 const int	cm_elem_size[] = {
-			0, 0, 3*sizeof(float), 3*sizeof(double), 4, 4
+			0, 0, 4, 4, 3*sizeof(float), 3*sizeof(double)
 		};
 
 /* Allocate a color coefficient matrix */
@@ -403,9 +403,9 @@ cm_multiply(const CMATRIX *cm1, const CMATRIX *cm2)
 		for (i = 0; i < cm1->ncols; i++) {
 		    const COLORV	*cp1 = cm_lval(cm1,dr,i);
 		    const COLORV	*cp2 = cm_lval(cm2,i,dc);
-		    res[0] += cp1[0] * cp2[0];
-		    res[1] += cp1[1] * cp2[1];
-		    res[2] += cp1[2] * cp2[2];
+		    res[0] += (double)cp1[0] * cp2[0];
+		    res[1] += (double)cp1[1] * cp2[1];
+		    res[2] += (double)cp1[2] * cp2[2];
 		}
 		copycolor(dp, res);
 	    }