When opening a 3D RGBA image in MITK, the application crashes with a segmentation fault, because in
mitkImageMapperGL2D.cpp:1277 image->GetPixelType().GetItkTypeId() returns 0:
if(((overwrite) || (node->GetProperty("opaclevelwindow", renderer)==NULL))
&& *(image->GetPixelType().GetItkTypeId()) == typeid(itk::RGBAPixel<unsigned char>))