Method Initialize

IO/Image/vtkTIFFReader.cxx:219–332

------------------------------------------------------------------------------

//------------------------------------------------------------------------------
bool vtkTIFFReader::vtkTIFFReaderInternal::Initialize()
{
  if (this->Image)
  {
    if (!TIFFGetField(this->Image, TIFFTAG_IMAGEWIDTH, &this->Width) ||
      !TIFFGetField(this->Image, TIFFTAG_IMAGELENGTH, &this->Height))
    {
      return false;
    }

    // Get the resolution in each direction
    TIFFGetField(this->Image, TIFFTAG_XRESOLUTION, &this->XResolution);
    TIFFGetField(this->Image, TIFFTAG_YRESOLUTION, &this->YResolution);
    TIFFGetField(this->Image, TIFFTAG_RESOLUTIONUNIT, &this->ResolutionUnit);

    // Check the number of pages. First by looking at the number of directories.
    this->NumberOfPages = TIFFNumberOfDirectories(this->Image);
    if (this->NumberOfPages == 0)
    {
      if (!TIFFGetField(this->Image, TIFFTAG_PAGENUMBER, &this->CurrentPage, &this->NumberOfPages))
      {
        // Check the Image Description tag to know the number of images
        // This is used by ImageJ
        char** description = new char*[255];
        if (TIFFGetField(this->Image, TIFFTAG_IMAGEDESCRIPTION, description))
        {
          // look for the number of images
          std::string desc = description[0];
          std::string::size_type pos = desc.find("images=");
          std::string::size_type pos2 = desc.find('\n');
          if ((pos != std::string::npos) && (pos2 != std::string::npos))
          {
            VTK_FROM_CHARS_IF_ERROR_RETURN(
              desc.substr(pos + 7, pos2 - pos - 7), this->NumberOfPages, false);
          }
        }
      }
    }

    // If the number of pages is still zero we look if the image is tiled.
    if (this->NumberOfPages <= 1 && TIFFIsTiled(this->Image))
    {
      this->NumberOfTiles = TIFFNumberOfTiles(this->Image);

      if (!TIFFGetField(this->Image, TIFFTAG_TILEWIDTH, &this->TileWidth) ||
        !TIFFGetField(this->Image, TIFFTAG_TILELENGTH, &this->TileHeight))
      {
        std::cerr << "Cannot read tile width and height from file" << endl;
      }
      else
      {
        TileRows = this->Height / this->TileHeight;
        TileColumns = this->Width / this->TileWidth;
      }
    }

    // Checking if the TIFF contains subfiles
    if (this->NumberOfPages > 1)