public void reverse(BufferedImage bim, ImageView background, TextField tf )
    {
        int w = bim.getWidth();
        int h = bim.getHeight();

        BufferedImage bim1 = new BufferedImage (w, h, 3);

        for (int i = 0 ; i < h ; i++ ){
            for (int j = 0; j < w ; j++){

                int rgb = bim.getRGB (j,i);

                if(tf.getText().equals("vertical")) {
                    bim1.setRGB(j, h - i - 1, rgb);
                }
                else if(tf.getText().equals("horizontal")){
                    bim1.setRGB (w - j - 1,i, rgb);
                }
            }
        }

        for (int i = 0 ; i < h ; i++ ){
            for (int j = 0; j < w ; j++){

                int rgb = bim1.getRGB (j,i);

                bim.setRGB (j, i, rgb);
            }
        }

        javafx.scene.image.Image image = SwingFXUtils.toFXImage(bim, null);
        background.setImage(image);
    }