diff --git a/src/osgVolume/Layer.cpp b/src/osgVolume/Layer.cpp
index 12b8ebf44..8c9ee0506 100644
--- a/src/osgVolume/Layer.cpp
+++ b/src/osgVolume/Layer.cpp
@@ -182,7 +182,7 @@ void ImageLayer::offsetAndScaleImage(const osg::Vec4& offset, const osg::Vec4& s
 
 void ImageLayer::rescaleToZeroToOneRange()
 {
-    osg::notify(osg::NOTICE)<<"ImageLayer::rescaleToZeroToOneRange()"<<std::endl;
+    osg::notify(osg::INFO)<<"ImageLayer::rescaleToZeroToOneRange()"<<std::endl;
 
     osg::Vec4 minValue, maxValue;
     if (computeMinMax(minValue, maxValue))
@@ -200,8 +200,8 @@ void ImageLayer::rescaleToZeroToOneRange()
         float scale = 0.99f/(maxComponent-minComponent);
         float offset = -minComponent * scale;
 
-        osg::notify(osg::NOTICE)<<"         scale "<<scale<<std::endl;
-        osg::notify(osg::NOTICE)<<"         offset "<<offset<<std::endl;
+        osg::notify(osg::INFO)<<"         scale "<<scale<<std::endl;
+        osg::notify(osg::INFO)<<"         offset "<<offset<<std::endl;
 
         offsetAndScaleImage(osg::Vec4(offset, offset, offset, offset),
                             osg::Vec4(scale, scale, scale, scale));
diff --git a/src/osgVolume/RayTracedTechnique.cpp b/src/osgVolume/RayTracedTechnique.cpp
index aa5ace75b..ed19572a3 100644
--- a/src/osgVolume/RayTracedTechnique.cpp
+++ b/src/osgVolume/RayTracedTechnique.cpp
@@ -251,6 +251,20 @@ void RayTracedTechnique::init()
 
         if (tf)
         {
+            float tfScale = 1.0f;
+            float tfOffset = 0.0f;
+
+            ImageLayer* imageLayer = dynamic_cast<ImageLayer*>(_volumeTile->getLayer());
+            if (imageLayer)
+            {
+                tfOffset = (imageLayer->getTexelOffset()[3] - tf->getMinimum()) / (tf->getMaximum() - tf->getMinimum());
+                tfScale = imageLayer->getTexelScale()[3] / (tf->getMaximum() - tf->getMinimum());
+            }
+            else
+            {
+                tfOffset = -tf->getMinimum() / (tf->getMaximum()-tf->getMinimum());
+                tfScale = 1.0f / (tf->getMaximum()-tf->getMinimum());
+            }
             osg::ref_ptr<osg::Texture1D> tf_texture = new osg::Texture1D;
             tf_texture->setImage(tf->getImage());
             tf_texture->setResizeNonPowerOfTwoHint(false);
@@ -258,10 +272,10 @@ void RayTracedTechnique::init()
             tf_texture->setFilter(osg::Texture::MAG_FILTER, osg::Texture::LINEAR);
             tf_texture->setWrap(osg::Texture::WRAP_R,osg::Texture::CLAMP_TO_EDGE);
 
-            osg::ref_ptr<osg::Uniform> tf_sampler = new osg::Uniform("tfTexture",1);
-
             stateset->setTextureAttributeAndModes(1, tf_texture.get(), osg::StateAttribute::ON);
-            stateset->addUniform(tf_sampler.get());
+            stateset->addUniform(new osg::Uniform("tfTexture",1));
+            stateset->addUniform(new osg::Uniform("tfOffset",tfOffset));
+            stateset->addUniform(new osg::Uniform("tfScale",tfScale));
 
         }
 
diff --git a/src/osgVolume/Shaders/volume_lit_tf_frag.cpp b/src/osgVolume/Shaders/volume_lit_tf_frag.cpp
index 805f62c6e..92c57be47 100644
--- a/src/osgVolume/Shaders/volume_lit_tf_frag.cpp
+++ b/src/osgVolume/Shaders/volume_lit_tf_frag.cpp
@@ -1,5 +1,9 @@
 char volume_lit_tf_frag[] = "uniform sampler3D baseTexture;\n"
+                            "\n"
                             "uniform sampler1D tfTexture;\n"
+                            "uniform float tfScale;\n"
+                            "uniform float tfOffset;\n"
+                            "\n"
                             "uniform float SampleDensityValue;\n"
                             "uniform float TransparencyValue;\n"
                             "uniform float AlphaFuncValue;\n"
@@ -83,7 +87,7 @@ char volume_lit_tf_frag[] = "uniform sampler3D baseTexture;\n"
                             "    vec4 fragColor = vec4(0.0, 0.0, 0.0, 0.0); \n"
                             "    while(num_iterations>0.0)\n"
                             "    {\n"
-                            "        float v = texture3D( baseTexture, texcoord).a;\n"
+                            "        float v = texture3D( baseTexture, texcoord).a  * tfScale + tfOffset;\n"
                             "        vec4 color = texture1D( tfTexture, v);\n"
                             "\n"
                             "        float a = v;\n"
diff --git a/src/osgVolume/Shaders/volume_tf_frag.cpp b/src/osgVolume/Shaders/volume_tf_frag.cpp
index 15cf5ca28..e4aa23ea0 100644
--- a/src/osgVolume/Shaders/volume_tf_frag.cpp
+++ b/src/osgVolume/Shaders/volume_tf_frag.cpp
@@ -1,5 +1,9 @@
 char volume_tf_frag[] = "uniform sampler3D baseTexture;\n"
+                        "\n"
                         "uniform sampler1D tfTexture;\n"
+                        "uniform float tfScale;\n"
+                        "uniform float tfOffset;\n"
+                        "\n"
                         "uniform float SampleDensityValue;\n"
                         "uniform float TransparencyValue;\n"
                         "uniform float AlphaFuncValue;\n"
@@ -76,7 +80,7 @@ char volume_tf_frag[] = "uniform sampler3D baseTexture;\n"
                         "    vec4 fragColor = vec4(0.0, 0.0, 0.0, 0.0); \n"
                         "    while(num_iterations>0.0)\n"
                         "    {\n"
-                        "        float v = texture3D( baseTexture, texcoord).a;\n"
+                        "        float v = texture3D( baseTexture, texcoord).a * tfScale + tfOffset;\n"
                         "        vec4 color = texture1D( tfTexture, v);\n"
                         "\n"
                         "        float r = color[3]*TransparencyValue;\n"
diff --git a/src/osgVolume/Shaders/volume_tf_iso_frag.cpp b/src/osgVolume/Shaders/volume_tf_iso_frag.cpp
index 5988f9e1f..60eeb9ed7 100644
--- a/src/osgVolume/Shaders/volume_tf_iso_frag.cpp
+++ b/src/osgVolume/Shaders/volume_tf_iso_frag.cpp
@@ -1,5 +1,9 @@
 char volume_tf_iso_frag[] = "uniform sampler3D baseTexture;\n"
+                            "\n"
                             "uniform sampler1D tfTexture;\n"
+                            "uniform float tfScale;\n"
+                            "uniform float tfOffset;\n"
+                            "\n"
                             "uniform float SampleDensityValue;\n"
                             "uniform float TransparencyValue;\n"
                             "uniform float IsoSurfaceValue;\n"
@@ -91,7 +95,7 @@ char volume_tf_iso_frag[] = "uniform sampler3D baseTexture;\n"
                             "            float r = (IsoSurfaceValue-v)/(previousV-v);\n"
                             "            texcoord = texcoord - r*deltaTexCoord;\n"
                             "\n"
-                            "            v = texture3D( baseTexture, texcoord).a;\n"
+                            "            v = texture3D( baseTexture, texcoord).a * tfScale + tfOffset;\n"
                             "            vec4 color = texture1D( tfTexture, v);\n"
                             "\n"
                             "            float px = texture3D( baseTexture, texcoord + deltaX).a;\n"
diff --git a/src/osgVolume/Shaders/volume_tf_mip_frag.cpp b/src/osgVolume/Shaders/volume_tf_mip_frag.cpp
index 49ef80443..17d03e747 100644
--- a/src/osgVolume/Shaders/volume_tf_mip_frag.cpp
+++ b/src/osgVolume/Shaders/volume_tf_mip_frag.cpp
@@ -1,5 +1,9 @@
 char volume_tf_mip_frag[] = "uniform sampler3D baseTexture;\n"
+                            "\n"
                             "uniform sampler1D tfTexture;\n"
+                            "uniform float tfScale;\n"
+                            "uniform float tfOffset;\n"
+                            "\n"
                             "uniform float SampleDensityValue;\n"
                             "uniform float TransparencyValue;\n"
                             "uniform float AlphaFuncValue;\n"
@@ -73,7 +77,7 @@ char volume_tf_mip_frag[] = "uniform sampler3D baseTexture;\n"
                             "    vec4 fragColor = vec4(0.0, 0.0, 0.0, 0.0); \n"
                             "    while(num_iterations>0.0)\n"
                             "    {\n"
-                            "        float v = texture3D( baseTexture, texcoord).s;\n"
+                            "        float v = texture3D( baseTexture, texcoord).s * tfScale + tfOffset;\n"
                             "        vec4 color = texture1D( tfTexture, v);\n"
                             "        if (fragColor.w<color.w)\n"
                             "        {\n"