private void greenScreenDraw(
                 Picture source,
                 Picture dest,
                 //Place the upper-left corner
                 // of the source image at the
                 // following location in the
                 // destination image.
                 int destX,
                 int destY){
    int width = source.getWidth();
    int height = source.getHeight();
    Pixel pixel = null;
    Color color = null;

    for(int row = 0;row < height;row++){
      for(int col = 0;col < width;col++){
        color = source.getPixel(
            col,row).getColor();
        if(!(color.equals(Color.GREEN))){
          pixel = dest.getPixel(
              destX + col,destY + row);
          pixel.setColor(color);
        }//end if
      }//end inner loop
    }//end outer loop

  }//end greenScreenDraw