diff --git a/examples/osgvolume/osgvolume.cpp b/examples/osgvolume/osgvolume.cpp
index 0891db9a8..362f3032a 100644
--- a/examples/osgvolume/osgvolume.cpp
+++ b/examples/osgvolume/osgvolume.cpp
@@ -589,10 +589,10 @@ int main( int argc, char **argv )
     while(arguments.read("--r_maxTextureSize",r_maximumTextureSize)) {}
 
     // set up colour space operation.
-    osg::ColorSpaceOperation colourSpaceOperation = osg::NO_COLOUR_SPACE_OPERATION;
+    osg::ColorSpaceOperation colourSpaceOperation = osg::NO_COLOR_SPACE_OPERATION;
     osg::Vec4 colourModulate(0.25f,0.25f,0.25f,0.25f);
     while(arguments.read("--modulate-alpha-by-luminance")) { colourSpaceOperation = osg::MODULATE_ALPHA_BY_LUMINANCE; }
-    while(arguments.read("--modulate-alpha-by-colour", colourModulate.x(),colourModulate.y(),colourModulate.z(),colourModulate.w() )) { colourSpaceOperation = osg::MODULATE_ALPHA_BY_COLOUR; }
+    while(arguments.read("--modulate-alpha-by-colour", colourModulate.x(),colourModulate.y(),colourModulate.z(),colourModulate.w() )) { colourSpaceOperation = osg::MODULATE_ALPHA_BY_COLOR; }
     while(arguments.read("--replace-alpha-with-luminance")) { colourSpaceOperation = osg::REPLACE_ALPHA_WITH_LUMINANCE; }
     while(arguments.read("--replace-rgb-with-luminance")) { colourSpaceOperation = osg::REPLACE_RGB_WITH_LUMINANCE; }
 
@@ -936,7 +936,7 @@ int main( int argc, char **argv )
     }
 
 
-    if (colourSpaceOperation!=osg::NO_COLOUR_SPACE_OPERATION)
+    if (colourSpaceOperation!=osg::NO_COLOR_SPACE_OPERATION)
     {
         for(Images::iterator itr = images.begin();
             itr != images.end();
diff --git a/include/osg/ImageUtils b/include/osg/ImageUtils
index 55d763ea0..2d1db317a 100644
--- a/include/osg/ImageUtils
+++ b/include/osg/ImageUtils
@@ -163,9 +163,9 @@ extern OSG_EXPORT osg::Image* createSpotLightImage(const osg::Vec4& centerColour
 
 enum ColorSpaceOperation
 {
-    NO_COLOUR_SPACE_OPERATION,
+    NO_COLOR_SPACE_OPERATION,
     MODULATE_ALPHA_BY_LUMINANCE,
-    MODULATE_ALPHA_BY_COLOUR,
+    MODULATE_ALPHA_BY_COLOR,
     REPLACE_ALPHA_WITH_LUMINANCE,
     REPLACE_RGB_WITH_LUMINANCE
 };
diff --git a/include/osgPresentation/SlideShowConstructor b/include/osgPresentation/SlideShowConstructor
index 247b5389e..ed90f05ac 100644
--- a/include/osgPresentation/SlideShowConstructor
+++ b/include/osgPresentation/SlideShowConstructor
@@ -293,7 +293,7 @@ public:
             cutoffValue(0.1),
             sampleDensityValue(0.005),
             sampleDensityWhenMovingValue(0.0),
-            colorSpaceOperation(osg::NO_COLOUR_SPACE_OPERATION),
+            colorSpaceOperation(osg::NO_COLOR_SPACE_OPERATION),
             colorModulate(1.0f,1.0f,1.0f,1.0f)
         {
             region[0] = region[1] = region[2] = 0.0f;
diff --git a/src/osg/ImageUtils.cpp b/src/osg/ImageUtils.cpp
index f88cb11ef..4075ebc52 100644
--- a/src/osg/ImageUtils.cpp
+++ b/src/osg/ImageUtils.cpp
@@ -615,9 +615,10 @@ osg::Image* createSpotLightImage(const osg::Vec4& centerColour, const osg::Vec4&
 }
 
 
-struct ModulateAlphaByColourOperator
+
+struct ModulateAlphaByColorOperator
 {
-    ModulateAlphaByColourOperator(const osg::Vec4& colour):_colour(colour) { _lum = _colour.length(); }
+    ModulateAlphaByColorOperator(const osg::Vec4& colour):_colour(colour) { _lum = _colour.length(); }
 
     osg::Vec4 _colour;
     float _lum;
@@ -650,10 +651,10 @@ osg::Image* colorSpaceConversion(ColorSpaceOperation op, osg::Image* image, cons
             osg::modifyImage(image, ModulateAlphaByLuminanceOperator());
             return image;
         }
-        case (MODULATE_ALPHA_BY_COLOUR):
+        case (MODULATE_ALPHA_BY_COLOR):
         {
             OSG_NOTICE<<"doing conversion MODULATE_ALPHA_BY_COLOUR"<<std::endl;
-            osg::modifyImage(image, ModulateAlphaByColourOperator(colour));
+            osg::modifyImage(image, ModulateAlphaByColorOperator(colour));
             return image;
         }
         case (REPLACE_ALPHA_WITH_LUMINANCE):
diff --git a/src/osgPlugins/p3d/ReaderWriterP3D.cpp b/src/osgPlugins/p3d/ReaderWriterP3D.cpp
index ebfe130a5..9f0b7ecd6 100644
--- a/src/osgPlugins/p3d/ReaderWriterP3D.cpp
+++ b/src/osgPlugins/p3d/ReaderWriterP3D.cpp
@@ -1105,10 +1105,9 @@ void ReaderWriterP3DXML::parseVolume(osgPresentation::SlideShowConstructor& cons
     std::string operation;
     if (getProperty(cur, "colorSpaceOperation", operation) || getProperty(cur, "colourSpaceOperation", operation))
     {
-        osg::ColorSpaceOperation colorOp = osg::NO_COLOUR_SPACE_OPERATION;
-        if (operation=="NO_COLOUR_SPACE_OPERATION") volumeData.colorSpaceOperation = osg::NO_COLOUR_SPACE_OPERATION;
+        if (operation=="NO_COLOR_SPACE_OPERATION") volumeData.colorSpaceOperation = osg::NO_COLOR_SPACE_OPERATION;
         else if (operation=="MODULATE_ALPHA_BY_LUMINANCE") volumeData.colorSpaceOperation = osg::MODULATE_ALPHA_BY_LUMINANCE;
-        else if (operation=="MODULATE_ALPHA_BY_COLOUR") volumeData.colorSpaceOperation = osg::MODULATE_ALPHA_BY_COLOUR;
+        else if (operation=="MODULATE_ALPHA_BY_COLOR") volumeData.colorSpaceOperation = osg::MODULATE_ALPHA_BY_COLOR;
         else if (operation=="REPLACE_ALPHA_WITH_LUMINANCE") volumeData.colorSpaceOperation = osg::REPLACE_ALPHA_WITH_LUMINANCE;
         else if (operation=="REPLACE_RGB_WITH_LUMINANCE") volumeData.colorSpaceOperation = osg::REPLACE_RGB_WITH_LUMINANCE;
     }
diff --git a/src/osgPresentation/SlideShowConstructor.cpp b/src/osgPresentation/SlideShowConstructor.cpp
index 1f319731a..efb874b43 100644
--- a/src/osgPresentation/SlideShowConstructor.cpp
+++ b/src/osgPresentation/SlideShowConstructor.cpp
@@ -2082,7 +2082,7 @@ void SlideShowConstructor::addVolume(const std::string& filename, const Position
     if (!image && !volume) return;
 
 
-    if (volumeData.colorSpaceOperation!=osg::NO_COLOUR_SPACE_OPERATION)
+    if (volumeData.colorSpaceOperation!=osg::NO_COLOR_SPACE_OPERATION)
     {
         OSG_NOTICE<<"Doing colour space conversion"<<std::endl;
         osg::ref_ptr<osg::Image> converted_image = osg::colorSpaceConversion(volumeData.colorSpaceOperation, image.get(), volumeData.colorModulate);