Colour invert - Java Code Bank

                /**
*@Auther  :Tharindra Galahena
*@Project :Colour invert
*@Date    :21/01/2011  
*/


import java.io.*;
import java.awt.*;
import java.awt.image.*;
import javax.imageio.*;
import javax.imageio.ImageIO;

public class Colour_inv{
	public static void main(String args[]){
	
		if(args.length < 2){
			System.out.println("USAGE: \n\n \t Colour_inv [input file] [output file] \n\n" +
							   "ex: \n" +
							   "\t im in.jpg out.jpg");	
			System.exit(0);
				
		}						   
		try {
				
				BufferedImage img = ImageIO.read(new File(args[0]));
				Raster raster = img.getData();
				int height = raster.getHeight();
				int width = raster.getWidth();
				int size = height*width;
				int [] pixels = new int[size * 3];
				raster.getPixels(0, 0, width, height, pixels);
 
				
				int k = 0;
				for(int i = 0; i < width*height*3; i++){
					pixels[k] = 255 - pixels[k];
					k ++;
				}
				BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
				WritableRaster raster2 = (WritableRaster) image.getData();
				raster2.setPixels(0,0,width,height,pixels);
				image.setData(raster2);
			
				File outputfile = new File(args[1]);
				ImageIO.write(image, "jpg", outputfile);

			}catch(Exception e){
				System.out.println(e);
			}
	}
}