double[][] smooth={{1/9.0, 1/9.0, 1/9.0},
			{1/9.0, 1/9.0, 1/9.0},
			{1/9.0, 1/9.0, 1/9.0}};

	double[][] sharp={{1/9.0, 1/9.0, 1/9.0},
			{1/9.0, -8/9.0, 1/9.0},
			{1/9.0, 1/9.0, 1/9.0}};

	public void filter(double[][] mat, BufferedImage img, int i, int j){
	    int r,g,b;
		for(int k=-1;k<2;k++){
			for(int l=-1;l<2;l++){
				r=(int)Math.round(mat[k+1][l+1]*getR(img,i+k,j+l));
				g=(int)Math.round(mat[k+1][l+1]*getG(img,i+k,j+l));
				b=(int)Math.round(mat[k+1][l+1]*getB(img,i+k,j+l));
				setRGB(img2,r,g,b,i,j);
			}
		}
	}

	public void setRGB(BufferedImage img,int r, int g, int b, int i, int j){
		int all= (a << 24) | (r << 16) | (g << 8) | b;
		img.setRGB(j,i, all);
	}
	public int getR(BufferedImage img, int i,int j){
		int rgb=img.getRGB(j,i);
		return (rgb >>>16) & 0xFF;
	}

	public int getG(BufferedImage img, int i,int j){
		int rgb=img.getRGB(j,i);
		return (rgb >>>8) & 0xFF;
	}
	public int getB(BufferedImage img, int i,int j){
		int rgb=img.getRGB(j,i);
		return (rgb >>> 0) & 0xFF;
	}

	public void iteratePixels(){
		int h = getHeight();
		int w = getWidth();

		for(int i=0; i<h;i++){
			for(int j=0; j<w; j++){
				filter(smooth,img,i,j);


		//		averageFilter(i,j);



			}
		}


	}