Support rgb -> xyz encoding.

1 files changed, 42 insertions, 0 deletions

diff --git a/src/colour_matrix.cc b/src/colour_matrix.cc
new file mode 100644
index 00000000..47ebf3e0
--- /dev/null
+++ b/src/colour_matrix.cc
@@ -0,0 +1,42 @@
+/*
+    Copyright (C) 2013 Carl Hetherington <cth@carlh.net>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#include "colour_matrix.h"
+
+/* sRGB color matrix for XYZ -> RGB.  This is the same as the one used by the Fraunhofer
+   EasyDCP player, I think.
+*/
+
+float const libdcp::colour_matrix::xyz_to_rgb[3][3] = {
+	{  3.24096989631653,   -1.5373831987381,  -0.498610764741898 },
+	{ -0.96924364566803,    1.87596750259399,  0.0415550582110882 },
+	{  0.0556300804018974, -0.203976958990097, 1.05697154998779 }
+};
+
+float const libdcp::colour_matrix::srgb_to_xyz[3][3] = {
+	{0.4124564, 0.3575761, 0.1804375},
+	{0.2126729, 0.7151522, 0.0721750},
+	{0.0193339, 0.1191920, 0.9503041}
+};
+
+float const libdcp::colour_matrix::rec709_to_xyz[3][3] = {
+	{0.4124564, 0.3575761, 0.1804375},
+	{0.2126729, 0.7151522, 0.0721750},
+	{0.0193339, 0.1191920, 0.9503041}
+};