java image processsing

public class testing
{
    static BufferedImage image;
    public static void main(String[] args) throws IOException {
    
    ArrayList<Integer> l1=new ArrayList<Integer>();
    ArrayList<Integer> l2=new ArrayList<Integer>();
    ArrayList<Integer> l3=new ArrayList<Integer>();
    
    image = ImageIO.read(new File("nn33.png"));
    int w = image.getWidth();
    int h = image.getHeight();
    for (int y = 0; y < h; y++)
    {
        for (int x = 0; x < w; x++)
        {
        Color c = new Color(image.getRGB(x, y));
        int A=c.getRed()+3;
        l1.add(A);
        int B=c.getBlue()+2;
        l2.add(B);
        int C=c.getGreen();
        l3.add(C);
        
        
        
        }
    }
}