correction colourConverter

include/Utils/colourConverter.h

@@ -32,6 +32,17 @@ namespace CGoGN {
 
 namespace Utils {
 
+/**
+ * Supported colour spaces
+ */
+enum ColourEncoding
+{
+	C_RGB = 0,
+	C_Luv = 1,
+	C_XYZ = 2,
+	C_Lab = 3
+} ;
+
 /**
  * Class for colour conversions between the enumerated colour spaces.
  * Usage :
@@ -47,10 +58,6 @@ class ColourConverter
 
 public: // types
 	typedef Geom::Vector<3,REAL> VEC3 ;
-	/**
-	 * Supported colour spaces
-	 */
-	enum ColourEncoding { C_RGB, C_XYZ, C_Luv, C_Lab } ;
 
 public: // methods
 	/**

include/Utils/colourConverter.hpp

@@ -181,7 +181,7 @@ void ColourConverter<REAL>::convertLuvToXYZ() {
 	REAL v1 = v/den + vn ;
 	den = 4.0*v1 ;
 	X = Y * 9.0 * u1 / den ;
-	Z = Y * (12 - 3*u1 - 20*v1) / den ;
+	Z = Y * (12.0 - 3.0*u1 - 20.0*v1) / den ;
 
 	XYZ = new VEC3(X,Y,Z) ;
 }