COMP: Prefer ZeroValue() for RGB pixel types

External initialization of static const member functions
is the same as through the ZeroValue function.

Author: hjmjohnson

src/Compatibility/Deprecated/ResampleRGBImage/Code.cxx

@@ -120,7 +120,7 @@ CreateImage(ImageType::Pointer image)
   ImageType::RegionType region(start, size);
   image->SetRegions(region);
   image->Allocate();
-  image->FillBuffer(itk::NumericTraits<ImageType::PixelType>::Zero);
+  image->FillBuffer(itk::NumericTraits<ImageType::PixelType>::ZeroValue());
 
   ImageType::PixelType pixel;
   pixel.SetRed(200);

src/Core/Transform/TranslateAVectorImage/Code.cxx

@@ -38,7 +38,7 @@ main(int, char *[])
   itk::ImageRegion<2> region(start, size);
   image->SetRegions(region);
   image->Allocate();
-  image->FillBuffer(itk::NumericTraits<VectorType>::Zero);
+  image->FillBuffer(itk::NumericTraits<VectorType>::ZeroValue());
 
   itk::TranslationTransform<double, 2>::Pointer          transform = itk::TranslationTransform<double, 2>::New();
   itk::TranslationTransform<double, 2>::OutputVectorType translation;

src/Filtering/ImageGrid/CropImageBySpecifyingRegion2/Code.cxx

@@ -109,7 +109,7 @@ CreateImage(ImageType::Pointer image)
 
   image->SetRegions(region);
   image->Allocate();
-  image->FillBuffer(itk::NumericTraits<ImageType::PixelType>::Zero);
+  image->FillBuffer(itk::NumericTraits<ImageType::PixelType>::ZeroValue());
 
   // Make a rectangle, centered at (100,150) with sides 160 & 240
   // This provides a 20 x 30 border around the square for the crop filter to remove