如何更改代码以避免此问题？

class m extends JPanel{
    BufferedImage img = null;Graphics2D g2;
    @Override
    protected void paintComponent ( Graphics g ) {
        super.paintComponent ( g );
        try {      
            img= ImageIO.read(new File("C:\\Users\\Saulius\\Pictures\\Saved Pictures\\eifelis.png"));
            } catch (Exception e) {
            }  
    g2=(Graphics2D)g;
    tt();
    g2.drawImage(img,null);
    try {

        ImageIO.write(img,"png",new File("C:\\Users\\Saulius\\Desktop\\FOTke.png"));

    } catch (IOException ex) {}
    o=1;   
    }
    int o=0; int[][] px;
    void tt(){
        px=new int[img.getWidth()][img.getHeight()];
        for(int y =0; y < img.getHeight() ; y++)
            {
                for (int x = 0; x < img.getWidth() ; x++) {
                    px[x][y]=img.getRGB(x,y);
                }
            }
        img= new BufferedImage(img.getWidth(),img.getHeight(),BufferedImage.TYPE_INT_ARGB);
        for(int yy =0; yy < img.getHeight(); yy+=1)
            {
            int newy =(int) Math.ceil(Math.sin(Math.toRadians((yy+1)*(90.0/img.getHeight())))*(yy+1));

            for (int xx = 0; xx < img.getWidth() ; xx+=1) {

                int newx =(int)Math.ceil(Math.sin(Math.toRadians((xx+1)*(90.0/img.getWidth())))*(xx+1)); 
                float[]hsb=new float[4];
                Color.RGBtoHSB(new Color(px[xx][newy-1]).getRed(),new Color(px[xx][newy-1]).getGreen(),new Color(px[xx][newy-1]).getBlue(),hsb);
                Color c =new Color(px[xx][newy-1]);
                img.setRGB(xx,yy,new Color(c.getRed(),c.getGreen(),c.getBlue(),50).getRGB());  
            }
        }

    }
}

enter image description here