1 files changed, 10 insertions, 8 deletions

diff --git a/src/lcms.c b/src/lcms.c
index 1f3ace3baac..cdfbc0ecf99 100644
--- a/src/lcms.c
+++ b/src/lcms.c
@@ -162,7 +162,7 @@ parse_xyz_list (Lisp_Object xyz_list, cmsCIEXYZ *color)
 
 DEFUN ("lcms-cam02-ucs", Flcms_cam02_ucs, Slcms_cam02_ucs, 2, 3, 0,
        doc: /* Compute CAM02-UCS metric distance between COLOR1 and COLOR2.
-Each color is a list of XYZ coordinates, with Y scaled to unity.
+Each color is a list of XYZ coordinates, with Y scaled about unity.
 Optional argument is the XYZ white point, which defaults to illuminant D65. */)
   (Lisp_Object color1, Lisp_Object color2, Lisp_Object whitepoint)
 {
@@ -186,15 +186,11 @@ Optional argument is the XYZ white point, which defaults to illuminant D65. */)
   if (!(CONSP (color1) && parse_xyz_list (color1, &xyz1)))
     signal_error ("Invalid color", color1);
   if (!(CONSP (color2) && parse_xyz_list (color2, &xyz2)))
-    signal_error ("Invalid color", color1);
+    signal_error ("Invalid color", color2);
   if (NILP (whitepoint))
-    {
-      xyzw.X = 95.047;
-      xyzw.Y = 100.0;
-      xyzw.Z = 108.883;
-    }
+    parse_xyz_list (Vlcms_d65_xyz, &xyzw);
   else if (!(CONSP (whitepoint) && parse_xyz_list (whitepoint, &xyzw)))
-    signal_error("Invalid white point", whitepoint);
+    signal_error ("Invalid white point", whitepoint);
 
   vc.whitePoint.X = xyzw.X;
   vc.whitePoint.Y = xyzw.Y;
@@ -295,6 +291,12 @@ DEFUN ("lcms2-available-p", Flcms2_available_p, Slcms2_available_p, 0, 0, 0,
 void
 syms_of_lcms2 (void)
 {
+  DEFVAR_LISP ("lcms-d65-xyz", Vlcms_d65_xyz,
+               doc: /* D65 illuminant as a CIE XYZ triple. */);
+  Vlcms_d65_xyz = list3 (make_float (0.950455),
+                         make_float (1.0),
+                         make_float (1.088753));
+
   defsubr (&Slcms_cie_de2000);
   defsubr (&Slcms_cam02_ucs);
   defsubr (&Slcms2_available_p);