[Insight-developers] GDCM: How to find out the correct pixel type

[Bill Lorensen]

Mathieu,

Here is some code we use in Slicer3 plugins to determine pixel and component
type at run-time:

namespace itk
{
  // Description:
  // Get the PixelType and ComponentType from fileName
  void GetImageType (std::string fileName,
                     ImageIOBase::IOPixelType &pixelType,
                     ImageIOBase::IOComponentType &componentType)
    {
      typedef itk::Image<unsigned char, 3> ImageType;
      itk::ImageFileReader<ImageType>::Pointer imageReader =
        itk::ImageFileReader<ImageType>::New();
      imageReader->SetFileName(fileName.c_str());
      imageReader->UpdateOutputInformation();

      pixelType = imageReader->GetImageIO()->GetPixelType();
      componentType = imageReader->GetImageIO()->GetComponentType();
    }

  // Description:
  // Get the PixelTypes and ComponentTypes from fileNames
  void GetImageTypes (std::vector<std::string> fileNames,
                      std::vector<ImageIOBase::IOPixelType> &pixelTypes,
                      std::vector<ImageIOBase::IOComponentType>
&componentTypes)
    {
    pixelTypes.clear();
    componentTypes.clear();

    // For each file, find the pixel and component type
    for (std::vector<std::string>::size_type i = 0; i < fileNames.size();
i++)
      {
      ImageIOBase::IOPixelType pixelType;
      ImageIOBase::IOComponentType componentType;

      GetImageType (fileNames[i],
                    pixelType,
                    componentType);
      pixelTypes.push_back(pixelType);
      componentTypes.push_back(componentType);
      }
    }
  }

Bill
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