public ComposeImageTile(Sector sector, String mimeType, Level level, int width, int height)
        throws IOException {
      super(sector, level, -1, -1); // row and column aren't used and need to signal that

      this.width = width;
      this.height = height;

      this.file =
          File.createTempFile(WWIO.DELETE_ON_EXIT_PREFIX, WWIO.makeSuffixForMimeType(mimeType));
    }