diff --git a/examples/osgterrain/osgterrain.cpp b/examples/osgterrain/osgterrain.cpp
index ceb420842..3f60f8ab9 100644
--- a/examples/osgterrain/osgterrain.cpp
+++ b/examples/osgterrain/osgterrain.cpp
@@ -164,6 +164,28 @@ int main(int argc, char** argv)
             }
         }
 
+        float minValue, maxValue;
+        if (arguments.read("--tf",minValue, maxValue))
+        {
+            readParameter = true;
+
+            osg::ref_ptr<osg::TransferFunction1D> tf = new osg::TransferFunction1D;
+            
+            tf->setInputRange(minValue, maxValue);
+            
+            tf->allocate(6);
+            tf->setValue(0, osg::Vec4(1.0,1.0,1.0,1.0));
+            tf->setValue(1, osg::Vec4(1.0,0.0,1.0,1.0));
+            tf->setValue(2, osg::Vec4(1.0,0.0,0.0,1.0));
+            tf->setValue(3, osg::Vec4(1.0,1.0,0.0,1.0));
+            tf->setValue(4, osg::Vec4(0.0,1.0,1.0,1.0));
+            tf->setValue(5, osg::Vec4(0.0,1.0,0.0,1.0));
+            
+            osg::notify(osg::NOTICE)<<"--tf "<<minValue<<" "<<maxValue<<std::endl;
+
+            terrain->setColorTransferFunction(tf.get());
+        }
+
     } while (readParameter);
     
 
diff --git a/include/osg/TransferFunction b/include/osg/TransferFunction
index 763881ea6..b1af8bae9 100644
--- a/include/osg/TransferFunction
+++ b/include/osg/TransferFunction
@@ -63,7 +63,7 @@ class OSG_EXPORT TransferFunction1D : public osg::TransferFunction
         
         unsigned int getNumberCellsX() const { return _colors.size(); }
 
-        osg::Vec4& getValue(unsigned int i) { return _colors[i]; }
+        void setValue(unsigned int i, const osg::Vec4& color) { _colors[i] = color; if (_image.valid()) _image->dirty(); }
         const osg::Vec4& getValue(unsigned int i) const { return _colors[i]; }
 
     protected:
diff --git a/src/osg/TransferFunction.cpp b/src/osg/TransferFunction.cpp
index c9ad121af..a68655f80 100644
--- a/src/osg/TransferFunction.cpp
+++ b/src/osg/TransferFunction.cpp
@@ -46,6 +46,8 @@ void TransferFunction1D::setInputRange(float minimum, float maximum)
 void TransferFunction1D::allocate(unsigned int numX)
 {
     _colors.resize(numX);
+    _image = new osg::Image;
+    _image->setImage(numX,1,1,GL_RGBA, GL_RGBA, GL_FLOAT, (unsigned char*)&_colors[0], osg::Image::NO_DELETE);
 }
 
 void TransferFunction1D::clear(const osg::Vec4& color)