diff --git a/data/shaders/utils/getRGBfromCIEXxy.frag b/data/shaders/utils/getRGBfromCIEXxy.frag
new file mode 100644
index 000000000..f4647c771
--- /dev/null
+++ b/data/shaders/utils/getRGBfromCIEXxy.frag
@@ -0,0 +1,17 @@
+// Using numerical value from here
+// http://content.gpwiki.org/index.php/D3DBook:High-Dynamic_Range_Rendering
+
+vec3 getRGBFromCIEXxy(vec3 YxyColor)
+{
+    float Yovery = YxyColor.x / YxyColor.z;
+    vec3 XYZ = vec3(YxyColor.y * Yovery, YxyColor.x, (1. - YxyColor.y - YxyColor.z) * Yovery);
+
+    mat3 XYZ2sRGB = mat3(
+        vec3(3.2405, -.9693, .0556),
+        vec3(-1.5371, 1.8760, -.2040),
+        vec3(-.4985, .0416, 1.0572));
+
+    vec3 sRGBColor = XYZ2sRGB * XYZ;
+    return vec3(pow(sRGBColor.x, 2.2), pow(sRGBColor.y, 2.2), pow(sRGBColor.z, 2.2));
+}
+