code: @Override
      public ImageHeader readHeader(InputStream input) throws IOException
      {
          final int headBytes = 3 + 3;
          final long skipped = input.skip(headBytes);
          checkSkippedError(skipped, headBytes);
  
          final int width = readInt(input, 2, false);
          final int height = readInt(input, 2, false);
          final ImageFormat format = ImageFormat.GIF;
  
          return new ImageHeaderModel(width, height, format);
      }
docs: /*
  ImageHeaderReader