diff --git a/Core/Code/Testing/files.cmake b/Core/Code/Testing/files.cmake
index 7fa5cd67a6..d400b6820b 100644
--- a/Core/Code/Testing/files.cmake
+++ b/Core/Code/Testing/files.cmake
@@ -1,110 +1,111 @@
 # tests with no extra command line parameter
 set(MODULE_TESTS
   mitkAccessByItkTest.cpp
   mitkCoreObjectFactoryTest.cpp
   mitkMaterialTest.cpp
   mitkActionTest.cpp
   mitkEnumerationPropertyTest.cpp
   mitkEventTest.cpp
   mitkFocusManagerTest.cpp
   mitkGenericPropertyTest.cpp
   mitkGeometry3DTest.cpp
   mitkGeometryDataToSurfaceFilterTest.cpp
   mitkGlobalInteractionTest.cpp
   mitkImageDataItemTest.cpp
   #mitkImageMapper2DTest.cpp
   mitkImageGeneratorTest.cpp
   mitkBaseDataTest.cpp
   #mitkImageToItkTest.cpp
   mitkInstantiateAccessFunctionTest.cpp
   mitkInteractorTest.cpp
   mitkITKThreadingTest.cpp
   # mitkLevelWindowManagerTest.cpp
   mitkLevelWindowTest.cpp
   mitkMessageTest.cpp
   #mitkPipelineSmartPointerCorrectnessTest.cpp
   mitkPixelTypeTest.cpp
   mitkPlaneGeometryTest.cpp
   mitkPointSetFileIOTest.cpp
   mitkPointSetTest.cpp
   mitkPointSetWriterTest.cpp
   mitkPointSetReaderTest.cpp
   mitkPointSetInteractorTest.cpp
   mitkPropertyTest.cpp
   mitkPropertyListTest.cpp
   #mitkRegistrationBaseTest.cpp
   #mitkSegmentationInterpolationTest.cpp
   mitkSlicedGeometry3DTest.cpp
   mitkSliceNavigationControllerTest.cpp
   mitkStateMachineTest.cpp
   mitkStateTest.cpp
   mitkSurfaceTest.cpp
   mitkSurfaceToSurfaceFilterTest.cpp
   mitkTimeSlicedGeometryTest.cpp
   mitkTransitionTest.cpp
   mitkUndoControllerTest.cpp
   mitkVtkWidgetRenderingTest.cpp
   mitkVerboseLimitedLinearUndoTest.cpp
   mitkWeakPointerTest.cpp
   mitkTransferFunctionTest.cpp
   #mitkAbstractTransformGeometryTest.cpp
   mitkStepperTest.cpp
   itkTotalVariationDenoisingImageFilterTest.cpp
   mitkRenderingManagerTest.cpp
   vtkMitkThickSlicesFilterTest.cpp
   mitkNodePredicateSourceTest.cpp
   mitkVectorTest.cpp
   mitkClippedSurfaceBoundsCalculatorTest.cpp
   #QmitkRenderingTestHelper.cpp
   mitkExceptionTest.cpp
 )
 
 # test with image filename as an extra command line parameter
 set(MODULE_IMAGE_TESTS
   mitkPlanePositionManagerTest.cpp
   mitkSurfaceVtkWriterTest.cpp
   #mitkImageSliceSelectorTest.cpp
   mitkImageTimeSelectorTest.cpp
   # mitkVtkPropRendererTest.cpp
   mitkDataNodeFactoryTest.cpp
   #mitkSTLFileReaderTest.cpp
 )
 
 # list of images for which the tests are run
 set(MODULE_TESTIMAGES
  # Pic-Factory no more available in Core, test images now in .nrrd format
   US4DCyl.nrrd
   Pic3D.nrrd
   Pic2DplusT.nrrd
   BallBinary30x30x30.nrrd
   binary.stl
   ball.stl
 )
 
 set(MODULE_CUSTOM_TESTS
     #mitkLabeledImageToSurfaceFilterTest.cpp
     #mitkExternalToolsTest.cpp
     mitkDataStorageTest.cpp
     mitkDataNodeTest.cpp
     mitkDicomSeriesReaderTest.cpp
     mitkDICOMLocaleTest.cpp
     mitkEventMapperTest.cpp
     mitkNodeDependentPointSetInteractorTest.cpp
     mitkStateMachineFactoryTest.cpp
     mitkPointSetLocaleTest.cpp
     mitkImageTest.cpp
     mitkImageWriterTest.cpp
     mitkImageVtkMapper2DTest.cpp
     mitkImageVtkMapper2DLevelWindowTest.cpp
+    mitkImageVtkMapper2DOpacityTest.cpp
 )
 
 # Create an artificial module initializing class for
 # the usServiceListenerTest.cpp
 usFunctionGenerateModuleInit(testdriver_init_file
                              NAME ${MODULE_NAME}TestDriver
                              DEPENDS "Mitk"
                              VERSION "0.1.0"
                              EXECUTABLE
                             )
 
 set(TEST_CPP_FILES ${testdriver_init_file} mitkRenderingTestHelper.cpp)
diff --git a/Core/Code/Testing/mitkImageVtkMapper2DOpacityTest.cpp b/Core/Code/Testing/mitkImageVtkMapper2DOpacityTest.cpp
new file mode 100644
index 0000000000..19bb96972b
--- /dev/null
+++ b/Core/Code/Testing/mitkImageVtkMapper2DOpacityTest.cpp
@@ -0,0 +1,73 @@
+/*===================================================================
+
+The Medical Imaging Interaction Toolkit (MITK)
+
+Copyright (c) German Cancer Research Center, 
+Division of Medical and Biological Informatics.
+All rights reserved.
+
+This software is distributed WITHOUT ANY WARRANTY; without 
+even the implied warranty of MERCHANTABILITY or FITNESS FOR 
+A PARTICULAR PURPOSE.
+
+See LICENSE.txt or http://www.mitk.org for details.
+
+===================================================================*/
+
+//MITK
+#include "mitkTestingMacros.h"
+#include "mitkRenderingTestHelper.h"
+
+//VTK
+#include <vtkRegressionTestImage.h>
+
+
+int mitkImageVtkMapper2DOpacityTest(int argc, char* argv[])
+{
+    // load all arguments into a datastorage, take last argument as reference rendering
+    // setup a renderwindow of fixed size X*Y
+    // render the datastorage
+    // compare rendering to reference image
+    MITK_TEST_BEGIN("mitkImageVtkMapper2DTest")
+
+    // enough parameters?
+    if ( argc < 2 )
+    {
+        MITK_TEST_OUTPUT( << "Usage: " << std::string(*argv) << " [file1 file2 ...] outputfile" )
+                MITK_TEST_OUTPUT( << "Will render a central transversal slice of all given files into outputfile" )
+                exit( EXIT_SUCCESS );
+    }
+
+    mitkRenderingTestHelper renderingHelper(640, 480, argc, argv);
+    //Set the opacity for all images
+    renderingHelper.SetProperty("opacity", mitk::FloatProperty::New(0.5f));
+    //for now this test renders in coronal view direction
+    renderingHelper.SetViewDirection(mitk::SliceNavigationController::Frontal);
+    renderingHelper.Render();
+
+    //use this to generate a reference screenshot or save the file:
+    bool generateReferenceScreenshot = false;
+    if(generateReferenceScreenshot)
+    {
+        renderingHelper.SaveAsPNG("/home/kilgus/Pictures/RenderingTestData/output.png");
+    }
+
+    //### Usage of vtkRegressionTestImage:
+    //vtkRegressionTestImage( vtkRenderWindow )
+    //Set a vtkRenderWindow containing the desired scene.
+    //vtkRegressionTestImage automatically searches in argc and argv[]
+    //for a path a valid image with -V. If the test failed with the
+    //first image (foo.png) check if there are images of the form
+    //foo_N.png (where N=1,2,3...) and compare against them.
+    int retVal = vtkRegressionTestImage( renderingHelper.GetVtkRenderWindow() );
+
+    //retVal meanings: (see VTK/Rendering/vtkTesting.h)
+    //0 = test failed
+    //1 = test passed
+    //2 = test not run
+    //3 = something with vtkInteraction
+    MITK_TEST_CONDITION( retVal == 1, "VTK test result positive" );
+
+    MITK_TEST_END();
+}
+