diff --git a/Modules/Core/test/mitkImageVtkMapper2DColorTest.cpp b/Modules/Core/test/mitkImageVtkMapper2DColorTest.cpp
index e45b0afdcb..dc33b72adf 100644
--- a/Modules/Core/test/mitkImageVtkMapper2DColorTest.cpp
+++ b/Modules/Core/test/mitkImageVtkMapper2DColorTest.cpp
@@ -1,57 +1,57 @@
 /*============================================================================
 
 The Medical Imaging Interaction Toolkit (MITK)
 
 Copyright (c) German Cancer Research Center (DKFZ)
 All rights reserved.
 
 Use of this source code is governed by a 3-clause BSD license that can be
 found in the LICENSE file.
 
 ============================================================================*/
 
 // MITK
 #include "mitkRenderingTestHelper.h"
 #include "mitkTestingMacros.h"
 
 // VTK
 #include <vtkRegressionTestImage.h>
 
 int mitkImageVtkMapper2DColorTest(int argc, char *argv[])
 {
   try
   {
     mitk::RenderingTestHelper openGlTest(640, 480);
   }
   catch (const mitk::TestNotRunException &e)
   {
     MITK_WARN << "Test not run: " << e.GetDescription();
     return 77;
   }
   // 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")
 
   mitk::RenderingTestHelper renderingHelper(640, 480, argc, argv);
   // Set the opacity for all images
-  renderingHelper.SetImageProperty("color", mitk::ColorProperty::New(0.0f, 0.0f, 255.0f));
+  renderingHelper.SetImageProperty("color", mitk::ColorProperty::New(0.0f, 0.0f, 1.0f));
   // for now this test renders in sagittal view direction
   renderingHelper.SetViewDirection(mitk::SliceNavigationController::Sagittal);
 
   //### Usage of CompareRenderWindowAgainstReference: See docu of mitkRrenderingTestHelper
   MITK_TEST_CONDITION(renderingHelper.CompareRenderWindowAgainstReference(argc, argv) == true,
                       "CompareRenderWindowAgainstReference test result positive?");
 
   //####################
   // Use this to generate a reference screenshot or save the file.
   //(Only in your local version of the test!)
   if (false)
   {
     renderingHelper.SaveReferenceScreenShot("/home/kilgus/Pictures/RenderingTestData/output.png");
   }
   //####################
 
   MITK_TEST_END();
 }